EFFECTS OF FORMALDEHYDE ON BRAIN OF RAT 



289 



TABLE 2 



Percentage weight increase in rats' brains, each kept for ten iveeks in 40 cc. of a 

 neutralized solution of 4 per cent formaldehyde made jive months before the experi- 

 ments began (averages for three brains at each age) 



' Maximum weight increase. 



TABLE 3 



Percentage loeight increase in rats' brains, each kept for ten weeks in 40 cc. of a 

 neutralized solution of 4 per cent formaldehyde made at the time the experiments 

 began (averages for three brains at each age) 



1 Maximum weight increase. 



