E. B. BLACK AND J. M. STENGLE 
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tween the M system of sheep and high and low 
potassium levels. Then, Tucker and Alleray at 
Babram in Cambridge made the connection be- 
tween the relationship of the antibody on the 
membrane and altering the high and low potas- 
sium types. Physiologists are crazy about stuff 
like this. They write to me and ask if I have any 
anti-L. I have to write back that I'm sorry we 
ran out of sheep blood typing simply because we 
had lack of support. I add that if they can get 
us any support we'd get back in and make some 
good anti-L, but I can't do it without support. 
