116 



FLETCHER, COWAN AND ARLITT 



5 



7 



12 

 11 



TABLE 3 — Continued 

 Day 20 Day 21 



Reaction Reaction 



No. of Chick 12 3 2 



1 



6 



4 



3 



6 



1 



3 



Day 24 

 Reaction 



1 2 



2 3 



4 2 



6 



10 



14 1 



Average 2 



20 



21 



23 



25 



Average 



41 2 



43 



46 



47 2 4 



48 2 3 



51 



Average 11/3 3 



71 



72 



74 



80 5 



81 5 



Average 5 



8 11 

 6 2/3 11 1/3 



1 19 



5 2/3 10 



9 

 5 



6 

 10 



8 





 









 

 

















 





 

 







6 



8 



1 1/2 7 



6 



13 



3 



13 

 10 



11 1/2 



10 



7 



13 



2 2/3 7 1/3 10 



9 

 8 



10 

 10 



1 6 13 



1 1/3 7 2/3 11 



1 14 

 5 3 



1 7 



2 1/3 8 



5 



12 

 12 



9 2/3 



