112 



CM. CHILD 



3 



5 



4 



Figs. 1 to 6 Effect of alcohol on regulation. Figure 1, diagrammatic, indicat- 

 ing levels of section. Figure 2, piece including region between levels 1 and 5 in 

 figure 1 : regulation in water. Figures 3 and 4, similar pieces: regulation in alco- 

 hol 1.5 per cent. Figures 5 and 6, posterior ends of alcohol pieces. 



