Browsing 1926 11th and 12th Reports of the Director of Veterinary Education and Research - Part 1, September 1926 by Issue Date

Browsing 1926 11th and 12th Reports of the Director of Veterinary Education and Research - Part 1, September 1926 by Issue Date

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  • The life histories of Trichostrongylus instabilis and T. rugatus of sheep in South Africa 
    Monnig, H.O.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    Experiments in connection with the following points are in progress, and have been partly completed: (a) Bionomics of the free-living larval stages. (b) The development of the worms in sheep at different seasons. (c) The ...
  • A check list and host list of the external parasites found on South African mammalia, aves, and reptilia 
    Bedford, G.A.H.; Du Toit, P.J. (Pretoria : Government Printer and Stationery Office, 1926)
    Before commencing to write this paper, it was realized only too fully that any check list or host list of the external parasites occurring on South African mammals, birds, and reptiles written at the present time would be ...
  • A group of micro-organisms transmitted hereditarily in ticks and apparently unassociated with disease 
    Cowdry, E.V.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. Pleomorphic, bacterium-like, Gram-negative, intracellular micro-organisms, which stained much less intensely with ordinary dyes than most bacteria, were found in fifteen ticks comprising examples of both the Argasidae ...
  • Blood studies : a contribution to the study of the blood and circulation in horsesickness 
    Neser, C.P.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. In the dikkop form of horse-sickness: (a) sedimentation of red corpuscles is much accelerated in the later stages of the disease, owing to clumping of the cells. This clumping is due to a property acquired by the ...
  • Cytological studies on heartwater II : Rickettsia ruminantium in the tissues of ticks capable of transmitting the disease 
    Cowdry, E.V.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    The evidence observed in favour of a causative relationship between Rickettsia ruminantium and the production of heartwater falls under the following headings: (1) The discovery of Rickettsia ruminantium in the tissues ...
  • Preliminary report upon the occurrence of hydrocyanic acid in the grasses of Bechuanaland 
    Henrici, M.; Du Toit, P.J. (Pretoria : Government Printer and Stationery Office, 1926)
    The occurrence of cyanogenetic compounds in grasses which do not show such in the normal fresh state is common during wilting or withering of natural veld in Bechuanaland. The phenomenon is particularly noticeable at the ...
  • Krimpsiekte 
    Henning, M.W.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    On reviewing the results of these experiments, there can be little doubt that the plant Cotyledon wallichii Harv. (kandelaar bos or bandjes bos) is at least one of the causes of the disease known as krimpsiekte in the ...
  • Splenectomy in domesticated animals and its sequelae, with special reference to anaplasmosis in sheep 
    De Kock, G.; Quinlan, J.B.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. A certain percentage of South African sheep kept locally become “carriers” of anaplasma. The course of the disease is evidently of such a mild nature that it has never been identified naturally. 2. When sheep introduced ...
  • The appearance of Gonderia ovis in the blood of splenectomised sheep 
    De Kock, G.; Quinlan, J.B.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. Gonderia ovis was noticed in the blood of splenectomized “carriers” of Anaplasma. 2. They were not observed in the blood of non-splenectomized sheep. 3. All transmission experiments to susceptible sheep, and in some ...
  • Cytological studies on heartwater I : the observation of Rickettsia ruminantium on the tissues of infected animals 
    Cowdry, E.V.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    A Gram-negative, intracellular, coccus-like micro-organism was found in cases of heartwater in the three species which are susceptible to the disease, namely, goats, sheep, and cattle. The presence of this micro-organism ...
  • Serological investigations into some diseases of domesticated animals in South Africa caused by trypanosomes 
    Robinson, E.M.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. The complement fixation test may be used for the diagnosis of dourine occurring naturally in South Africa, provided T. equiperdum antigen is employed. 2. Animals infected with T. brucei react to the complement fixation ...
  • Contributions to the helminth fauna of South Africa 
    Baer, J.G.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    Whereas the South American and Australian helminth-fauna is comparatively well known, that of South Africa has been sadly neglected until recent years. The probable reason of this is that scientific explorers do not generally ...
  • Physiological plant studies in South Africa Part I : wilting and osmotic phenomena of grasses and other plants under arid conditions 
    Henrici, M.; Du Toit, P.J. (Pretoria : Government Printer and Stationery Office, 1926)
    A description of the meteorological, tellurical, and edaphic features of a typical farm in the semi-arid region of Bechuanaland is given, and the osmotic behaviour of the local flora recorded. The differences between suction ...
  • Helminths collected from the domestic fowl (Gallus domesticus) and the domestic pigeon (Columba livia) in Natal 
    Le Roux, P.L.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. The domestic fowl (Gallus domesticus) in Natal suffers heavily from verminous infestations. 2. Six species of nematodes and nine species of cestodes have been collected from the digestive tract of the fowl. 3. Three ...
  • Urginea macrocenta (Baker) : its toxic effects on ruminants 
    Mitchell, D.T.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    In South Africa three species of liliaceous plants occur to which the common name of Slangkop (snake head) has been given, all of which have been blamed for many years as a cause of mortality in stock. They are: Urginea ...
  • Physiological plant studies in South Africa Part II : transpiration of grasses and other plants under arid conditions 
    Henrici, M.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    From the locus of writing this article and the companion paper on “Wilting,” it is impossible to consult the extensive literature on transpiration available in European libraries, and for many points of reference Burgerstein's ...
  • Necrobacillosis in equines : clinical, pathological, and aetiological studies on an outbreak 
    Quinlan, J.B.; Steck, W.; Robinson, E.M.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    The primary lesions are infected wounds in various parts of the body, most frequently in the extremities, from which, owing to the invasion with virulent necrosis bacilli, necrosis and gangrene and collateral phlegmons ...
  • Remarkable case of volvulus in a calf due to aplasia of the mesentery 
    Steck, W.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    (1) A three-month-old bull-calf dies suddenly as a result of a complicated volvulus. (2) This volvulus is due to a reduction of the mesentery (probably congenital) in a part of the small intestine, which allows a part to ...
  • The chlorophyll content of grasses in Bechuanaland 
    Henrici, M.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    1. The chlorophyll-content of Bechuanaland grasses is not constant throughout the year, but varies from a very high initial value on young leaves, decreases according to the duration and intensity of drought periods, and ...
  • Does a species of leishmania occur in the goat? 
    Curson, H.H.; Theiler, Arnold, Sir, 1867-1936; Union of South Africa. Department of Agriculture (Pretoria : Government Printer and Stationery Office, 1926)
    Under the circumstances, it is felt that, provisionally at any rate the parasite may be considered as a species of Leishmania, and it is proposed that it be named Leishmania caprae. n.s. The smear is now in the possession ...