XB, 1 Wharton: Eggs of Ascaris lumbricoides 22 
artificial juices, at 37°, as any embryos which were not com- 
pletely developed were always killed by the rise in temperature. 
The ascarids of the horse and dog were able to undergo their 
complete development and hatch in artificial pancreatic juice 
at a temperature of 37°. 
My experiments in hatching the eggs of Ascaris lumbricoides 
have not been conclusive except on one point, and that is that 
the embryos must be completely developed before they are in- 
troduced into the alimentary canal. Artificial gastric and pan- 
creatic juices have no apparent effect on the structure of the 
shell, but I have not been able to hatch the embryos with any 
degree of regularity. This is probably due to faulty technique, 
as in other respects the action of these eggs closely parallels 
Martin’s results on the pig ascaris. 
