THF GROWTH OF THE DRAIN. 



These in turn agree very closely with the observations 

 made by Thudichum on English brains, 1 and which give: 



Percentage of water lost at 95 C, from cortical grey matter, 

 85*27 per cent ; percentage of water lost at 95 C., from white 

 matter of hemisphere, 70*23 per cent. 



Taken all together, these results indicate in a satisfac- 

 tory way the constancy of the proportion of water in the 

 parts named. The variations which occur are readily 

 explained by slight differences in the localities from 

 which the samples tested were obtained and by errors of 

 experiment. 



Directly connected with the percentage of water is 

 the specific weight of these substances. Obersteiner 2 

 has made some very careful observations on the specific 

 gravity of the cerebral cortex from the different portions 

 of the hemispheres, and finds a striking and significant 

 increase in this figure on passing from the frontal to 

 the occipital lobes. 



TABLE 12. SHOWING THE SPECIFIC GRAVITY OF THE EN- 

 CEPHALON AT DIFFERENT POINTS. (Obersteiner.} 



F. Frontal lobe ; P. Parietal lobe ; O. Occipital lobe ; T. 



Temporal lobe ; C. str. Corpus striatum ; Th. O. Thalamus 

 Opticus ; C. dent. Corpus dentatum. 



1 Thudichum, Tuke's Dictionary of Psychological M edidne^ 1892. 



2 Obersteiner, Centralblatt f. Nervenheilkunde, 1894. 



