Aston.—The Chemistry of Bush Sickness in Ruminants. 721 
pasture on which ruminants would die in three to nine months, sheep being 
most and cattle least susceptible. Ruminants, however, when given turnips 
and hay made from the bush-sick pasture, can be kept healthy while still 
grazing on the same pasture which as a sole ration would bring on bush 
would undoubtedly continue to exert its deleterious effects. Again, when 
an animal at the onset of the sickness has been sent away for a change to 
other explanation of the cause of bush ‘sickness but that which postulates 
a deficient food-ingredient. It is not to be thought that the organic 
nutrients are deficient ; grasses and clovers grow particularly well on these 
pumice lands, and provide an ample organic ration, It must therefore be 
phorus, potassium, sodium, magnesium, chlorine, iron, and sulphur, named in 
the relative order in which they occur in the animal’s ashes. Tron is the only 
quantity. Phosphorus, although often deficient in the soil, is obviously 
not low enough to produce nutrition disease in the animal. Phosphorus 
is stored in the bone of the animal; bush-sick animals show no disease 0 
the bones or other symptoms usually manifested by deficient phosphorus- 
supply in the diet. Moreover, administration of phosphates to the animal, 
either medicinally or through the pasture, does not enable them to be kept 
permanently free from bush sickness. There may be other elements which 
