BRAINS AND BRAIN PRESERVATIVES— HRDLICKA. 



253 



BRIEF DETAILS CONCERNING THE VARIOUS PRESERVATIVES. 



THREE PER CENT FORMALIX SOLUTION. 



All specimens increased in weight, nianinial l)rains more than 

 human; brains of the ^'oung-, human and mammal, increased more 

 than those of adults. A decrease in weight in all classes of specimens 

 set in within the tirst month and continued slowh' as far as observed 

 (two 3'ears). In every instance the weight of the brain at the end of 

 two years was still greater than the original. 



1 week, 

 1st change 

 of solution. 



1 month. 

 2(1 change 

 of solution. 



Cat. No. 224803, U.S.N.M. Phoca vitnl, 3 per cent formalin. 

 Fig. 4. — Curve showing changes in brain weights in 3 per cent formalin 



FIVE PER CENT FORMALIN SOLl'TION. 



All specimens rose in weight, but the young, at least, less so than 

 in the 3 per cent solution; mammal brains augmented more than 

 human; some of the brains of the young showed a greater increase, 

 some a little less than the 'average of the corresponding series of 

 adults. A decrease in weight in all specimens set in within the tirst 

 month, and continued slowl}' for at least eighteen months. At the end 

 of one to one and one-half years the weight of the adult human and' 

 mammal brains was in most instances still above the original: in the 

 case of the young, in one human and one mammal it was aViove, in one 

 human and one mammal well below, the original. 



