Alexander, R.A.Mason, J.H.Du Toit, P.J.2016-07-132016-07-1320161939Alexander, RA & Mason, JH 1939, ‘Studies of the Rickettsias of the Typhus-Rocky-Mountain-Spotted-Fever Group in South Africa. II. Morphology and cultivation’, Onderstepoort Journal of Veterinary Science and Animal Industry, vol. 13, no. 1, pp. 25-39.0330-2465http://hdl.handle.net/2263/55541The 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.In the previous article (this journal) details were given of the source and method of isolation of five strains of rickettsia. These strains have been maintained either by serial passage in guinea pigs, or by cultivation on the chorio-allantoic membrane of the chick embryo, or by both methods. In this paper the microscopic appearance of the scrotal exudate and method of egg-membrane cultivation will be described and the morphology of the rickettsias compared particularly in view of Pinkerton's classification of this group of organisms.en© ARC – Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © University of Pretoria. Department of Library Services (digital).Veterinary MedicineVeterinary Medicine -- South AfricaStudies of the Rickettsias of the Typhus-Rocky-Mountain-Spotted-Fever Group in South Africa. II. Morphology and cultivationArticle