Monnig, H.O.Theiler, Arnold, Sir, 1867-1936Union of South Africa. Department of Agriculture2020-12-222020-12-2220201926Monnig, HO 1926, ‘The life histories of Trichostrongylus instabilis and T. rugatus of sheep in South Africa’, 11th and 12th Reports of the Director of Veterinary Education and Research Part 1, pp. 231-251.0330-2465http://hdl.handle.net/2263/77461The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.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 effects of the parasites on their hosts. (d) The prevention of infection. (e) The treatment of infested sheep.21 pages : illustrationsPDFen©1926 Union of South Africa, Dept. of Agriculture (original). © 2020 University of Pretoria. Dept. of Library Services (digital).Veterinary reportsVeterinary medicineVeterinary parasitologySheep -- DiseasesTrichostrongylus instabilisTrichostrongylus rugatusVeterinary medicine -- South AfricaArticle