Figs.61 to 70 Differential inbibition. 61 to 63, lateral views of three embryos 
after 14 hours in m/5 LiCl and 5 days in water. Eggs in early gastrula stages 
when placed in the solution. The greater inhibition here appears to be a 
consequence of the higher susceptibility of the eggs at the time of gastrulation. 
Exp. 121.1 E. 64, 65, dorsal views of two embryos after 24 hours in m/5000 
KNC and 5 days in water. Eggs in two-cell stage when placed in the 
solution. Microcephalic with shallow neural groove and persistent yolk 
plug. Exp. KNC-C.8a. 66, a spina bifida and 67, 68, two other embryos 
after 4 days in m/10,000 KNC and 8 days in water. Eggs in two-cell stage 
when placed in the solution. Same experiment as embryo shown in figure 
23. 68 is shown with the anterior end twisted somewhat to one side, to show the 
almost completely united ventral suckers. 69, 70, two embryos after 4 days in 
KCN + 8 days in water. Less than 1 per cent of the embryos in this experiment 
showed this extreme inhibition. Exp. KNC-C.10. m, mouth; 0, olfactory pit; 
t, tail; v.s., ventral sucker; y.p., yolk plug. 
492 
