Research and Investigation. 77 



Diseases due to Plant Poisons. 



Feeding tests with suspected plants or fungi. 



Diseases due to Parasites. 



Investigation of life-history of Strongylus filaria, DistoTua Jiepa- 

 ticum, and Strungylus instahilis. The pathological conditions pro- 

 duced in the infected host. Methods of prophylactic and medical 

 treatment. 



Diseases of Unknown Origin. 



Staggers in Horses. — Pathological studies to clear up conditions 

 conducive to causation and enable control of disease. 



Staggers in Cattle. — Research to confirm results of feeding expe- 

 riments. 



Dunzielcte in Horses. — Experiments to ascertain causal agent, 

 incubation period, etc. 



Stijfzielde in Cattle. — Investigations and ecological survey to 

 ascertain if disease is caused by a veld plant. 



Osteoporosis in Horses. — Investigation with a view to elucidating 

 cause. 



Lamziekte in Cattle and associated condition of Pica. — Research 

 as to means of prevention. 



Gauwziekte in Sheep. — Experiments with a view to confirming 

 theory that disease is of plant origin and to ascertain actual causal 

 agent. 



The Biochemical Section of the Division is carrying on work on — 



(a) Animal nutrition with special reference to malnutrition 



and diseases influenced by diet. 



(b) Phytochemistry and soil chemistry in reference to pica as 



precursor to lamziekte. 



(c) Production of toxins by putrefactive bacteria with special 



reference to lamziekte. 



(d) Chemical and physiological investigation of vSouth African 

 poisonous plants. 



(e) Chemical study of parasiticides. 



(/) Dips, dipping, and control of changes in dipping tanks. 



Division of Botany. 



Botanical investigations, in conjunction with Division of Veteri- 

 nary Research, of gallamziekte, gouAvziekte, jagziekte, geel-dikkop, 

 stijfziekte, dunziekte. 



(6) DISEASES OF PLANTS. 



Division of Botany. 



Research work into citrus canker, potato and tomato diseases. 

 Bacterial spot of citrus, bacterial blight of pear blossoms, citrus fruit 

 spot, black spot of mangoes, die-back of fruit trees, apple cracking 

 disease, dry-rot of maize, walnut bacteriosis, bean bacteriosis, root 

 disease of sugar-cane, cane leaf-spot, cotton bacterial spot, almond 

 and apricot die-back, and flag smut of wheat. 



