NO. 1451. BRAINS AND BRAIN PRESERVATIVES— HRDLICKA. 283 



week nor were they proportionate to the weight of the specimens. 

 The brain in the 6 c. c. to the gram solution lost 1.05 per cent in 

 weight, that weighed daily 3.38 per cent. 



Changes in the brain weighed ever}- day: Considerable rise the tirst 

 twent^^-four hours, continuation of rise until the sixth daj^, then slow 

 decline; a moderate rise of two days' duration after the first and of 

 one day after the second change of solution. 



FIFTEEN PER CENT FORMALIN. 



End of iirst week: Weight of specimens in 3 c. c. to the gram solution 

 had risen in average nearly 13 per cent, or one-eighth of the original. 

 Variation: From 107.61 (original weight, 98.5 grams) to 116.48 per 

 cent (original weight, 91 grams) = 8. 87 per cent. The two heaviest 

 brains (119 and 111.8 grams) gained, respectively, 12.1 and 13.5 per 

 cent, the two lightest ones (94 and 91 grams) 11.7 and 16.4 per cent. 

 The brain in the 6 c. c. to the gram liquid (original weight, 97 grams) 

 gained but 9.08 per cent, less than any of the above with one excep- 

 tion, that weighed daily (original weight, 105.5 grams) gained but 8. 53 

 per cent. 



End of tirst month: Weight of all the nine specimens in 3 c. c. to 

 the gram solution has diminished (—0.88 to 2.31 per cent). Variation: 

 From 105.58 to 115.38 per cent=9.8 per cent. The changes are 

 fairly harmonious with those of the first week, but are not propor- 

 tionate to the weight of the specimens. The brain in the 6 c. c. to the 

 gram solution lost 5.95 per cent, much more than any of the above, 

 that weighed dail}" 3.49 per cent, also more than any of those in similar 

 quantity of solution but weighed less frequently. 



Changes in the brain weighed daily: A moderate rise in weight 

 during the first twenty-four hours, maximum of rise on fourth day, 

 then slow, continuing loss; one daj^'s rise after each change of solution. 



SATURATED SOLUTION OF SODIUM CHLORIDE, WITH ,5 PER CENT 



FORMALIN. 



End of first week: Weight of l)rains in the 3 c. c. to the gram solu- 

 tion had diminished in average by 7 per cent, or one-fourteenth of the 

 original. Variation: From 90.33 (original weight, 95.2 grams) to 

 95.19 per cent (original weight, 104 grams) = 4. 86 per cent. The two 

 heaviest brains (107.7 and 105 grams) lost, respectively, 6.6 and 5.72 

 per cent; the two lightest (89.7 and 84.5 grams) 5.8 and 5.9 per cent. 

 The specimen in the 6 c. c. to the gram solution (original weight, 95.5 

 grams) lost 6.8 per cent, that weighed every day 7.9 per cent. 



End of first month: Weight of all nine brains in the 3 c. c. to the 

 gram solution decreased (—3.15 to 5.23 per cent). Variation: From 

 85.61 to 91.82 per cent=6.2 per cent. The decrease was quite alike 

 in most of the nine specimens and harmonized somewhat with that of 



