NO. 1451. BRAIXS AND BRAIN PRESERVATIVES— HRDLICKA. 285 



the tirst week, but was not proportionate to the original weight. The 

 brain in the 6 c. c. to the gram solution fell to 90.05 per cent of origi- 

 nal weight; after which it diminished imtil it became relatively the 

 lightest of all; that weighed every day was damaged and discarded at 

 first change. 



1,080 SPECIFIC GRAVITY SODIUM CHLORIDE SOLUTION WITH 5 PER 



CENT FORMALIN. 



End of first week: Two of the nine brains in the 3 c. c. to the gram 

 solution showed a slight increase, seven a slight decrease, in weight. 

 Variation: From U3.86 (original weight, 106 grams) to 104.2 per cent 

 (original weight, 107 grams) = 10. 3-1 per cent. The two heaviest brains 

 (112 and lOT grams) gained, respectively, 2.68 and 1.2 per cent, the two 

 lightest (95 and 94 grams) lost 1.58 and 3.73 per cent in weight. The 

 brain in the 6 c. c. to the gram solution (original weight, 105 grams) 

 lost 5.72 per cent, more than any of the above but one, and that 

 weighed every day (original weight, 103 grams), lost 2.92 per cent in 

 weight. 



End of first month: All the brains in the 3 c. c. to the gram solu- 

 tion lost slightly in weight after the end of the first week (—1.3 to 

 — 3.72 per cent), but two are still slightly heavier than originally. 

 Variation: From 92.45 to 102.33 per cent=9.88 per cent. The changes 

 were not wholly harmonious with those during the first week, or pro- 

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

 the gram solution lost more than an}" but two of the above (2.02 per 

 cent) and is now relatively the lightest; that weighed every day lost 3 

 per cent and is now also among the relatively lightest specimens. 



Changes in the brain weighed daily: The first day a very slight loss 

 of weight, which continued slowly till the first change (the first day 

 after which there was an insignificant gain) and then up to the one 

 month change (which produced no result). After the thirty -fifth day 

 there were two weeks of stability, with a slight loss following. 



1,015 SPECIFIC GRAVITY SODIUM CHLORIDE SOLUTION WITH 5 PER 



CENT FORMALIN. 



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

 had risen in average a little less than 2 per cent, or a little less than 

 one-fiftieth of the original. Variation: From 101.29 (original weight, 

 116 grams) to 102.45 per cent (original weight, 102 grams) =1.2 per 

 cent. The brain in 6 c. c. to the gram solution, (123 grams original 

 weight) rose 2.03 per cent; that weighed daily (11.4 grams original 

 weight) 1.31 per cent. 



End of first month: Weight of both specimens in 3 c. c. to the gram 



solution has diminished (—1.43 per cent and —1.7 per cent). Varia- 



i tion=1.41 per cent. The specimen in 6 c.c. to the gram solution 



