LEUKEMIA AND PSEUDO LEUKEMIA 149 
and iron, may be of benefit in mild forms of the disease. Arsenic 
might also prove beneficial. 
Prevention. In sporadic cases of leukemia, no special precau- 
tions against the spread of the disease can be recommended other 
than the usual precaution of isolating or destroying the sick bird. 
Where several cases develop in the course of a few days, all birds 
showing the slightest abnormal appearance should be immediately 
separated from the flock. The droppings, litter, etc., should be re- 
moved and the quarters thoroughly disinfected. The drinking water 
may be medicated with permanganate of potash up to a 1—-1000 so- 
lution. 
Pseudo leukemia. Ellerman and Bang regard this affection as 
being indicated by the same lesions as the true leukemia. The en- 
largement of the spleen and of the liver is often very noticeable. 
The blood is not leukemic. They consider it very probable that this 
disease has the same cause as true leukemia for cases of pseudo 
leukemia are encountered in outbreaks of the true disease. Inocu- 
lation of a hen with organs from a case of pseudo leukemia caused 
alteration of organs, typical of leukemia, with a blood picture sug- 
gesting the beginning stage of leukemia. 
REFERENCES 
1. Pickens. Leukemia and pseudo leukemia. Rept. N. Y. State Vet. 
Col. 1915-1916, p. 226. 
2. Ellerman u Bang. Experimentelle leukimie bei Hiihnern. Cen. 
tralbl. f. Bakteriol. (Etc.), 1 Abt. Orig., Bd. 46, 1908, S. 595. 
3. Warthin. Leukemia of the common fowl. J. Inf. Dis., Vol. 4, 
1907, p. 309. 
