280 PROCEEDINGS OF THE NATIONAL MUSEUM. 



c. c. to the gram solution lost most and is now relatively the lightest 

 of the whole series, excepting the one weighed every day. 



The brain weighed daily showed a great gain during the first day, 

 reached maximum on the fifth, and began to decline on the seventh; 

 after change of solution it rose during two days, and then again began 

 to lose, which was repeated identically after the one-month change. 



FIVE PER CENT FORMALIN. 



End of first week: Weight of brains in 3 c. c. to the gram solution 

 had risen in average 17.9 per cent, or a little over one-sixth of the 

 original. Variation: From 110.12 (specimen of 119.7 grams original 

 weight) to 120 per cent (specimen of 99 grams original weight) = 3. 88 

 per cent. The two heaviest brains (119.7 and 117 grams) gained, 

 respectively, 16.1 and 18.4 per cent in weight, the two lightest ones 

 (98.5 and 95.5 grams) 17.8 and 19.1: per cent. The brain in the 6 c. c. 

 to the gram solution (100.5 grams original weight) had risen 18.9 per 

 cent; that weighed every day 17.8 per cent. 



End of first month: Onl}' one specimen showed a slight gain (-f 1.08 

 per cent), while in eight there was a loss (—0.86 to —2.39 per cent). 

 Variation: From 113.87 to 119.66 per cent =5.79 per cent. The 

 changes were not quite harmonious with those of the first week, or 

 proportionate to the weight of the specimen. The brain in the 6 c. c. 

 to the gram solution lost 2.09 per cent, that weighed dailv 2.39 per 

 cent of weight, both above the average. 



The brain weighed daily gained much on the first day, reached a 

 maximum on the fourth day. declined slowl}^ to seventh, rose after 

 change of solution during two days, fell gradually' to the end of the 

 first month, then, after a change of solution, rose one day and has been 

 slowly losing since. 



TEN PER CENT FORMALIN. 



End of first week: Weight of brains in 3 c. c. to the gram solution 

 had risen in average 15 per cent, or nearly one-seventh of the original. 

 Variation: From 112.84 (original weight, 97.5 grams) to 116.87 per cent 

 (oi-iginal weight, 80 grams)=4.03 per cent. The two heaviest brains 

 (1 12 and 110.5 grams) gained, respectively, 11.73 and 15.38 per cent, 

 the two lightest (96.5 and 80 grams) 15.54 and 16.87 per cent. The 

 brain in the 6 c. c. to the gram solution (125 grams original weight) 

 gained but 14 per cent of weight, that weighed daily (102 grams orig- 

 inal weight) 16.17 per cent. 



End of first month: The weight of one of the nine specimens in 3 

 c. c. to the gram solution has very slightly (+0.45 per cent) increased, 

 that of the other eight slightly to moderately (—1.07 to —3.29 per 

 cent) decreased. Variation: From 110.31 to 115.63 per cent = 5.32 

 per cent. The changes did not quite harmonize with those of the first 



