METABOLIC ACTIVITY OF NERVOUS SYSTEM ol 
of the dogfish that the differences in the reduction of water in the 
two cases is that ‘‘the nervous (and body) changes which occur 
in the mammal are post-embryonic and extra-utero. In the 
TABLE 4 
Showing the percentage of water in thebrain sof several fish. Data compiled from 
various sources 
c “iy || Sans 
SPECIES Pet ene 8 : Rhee Sere eer SEX OBSERVER 
a TRACT 
Cyprinus carpio....... 77.50] 8.33 Von Bibra (1854) 
Cyprinus barbus....... 78.00} 9.37 Von Bibra (1854) 
SalmowarcOnans.,.4e5 - 78.92) 8.42 Von Bibra (1854) 
' ~80.00 
JUGS Cxfornagoadeeoue 81.93} 7.25 Von Bibra (1854) 
FEES In ae ees, SN 8. 9.10 Schlossberger 
. (1856) 
Cyprinus auratus...... 77.80 Bezold (1857) 
Summer flounder...... 539 | 393) 0.253) 78.05 Donaldson (1905) 
Summer flounder...... 540 | 397| 0.305] 79.06 o'| Donaldson (1905) 
Summer flounder...... 540 | 386) 0.351] 78.00 o'| Donaldson (1905) 
Summer flounder...... 560 | 411] 0.338] 78.70 Donaldson (1905) 
Summer flounder...... 630 | 409) 0.279) 78.06 o'| Donaldson (1905) 
Summer flounder...... 640 | 404) 0.293) 78.43 @| Donaldson (1905) 
Summer flounder...... 682 | 405) 0.288) 79.56 Donaldson (1905) 
Summer flounder...... 834 | 440] 0.311] 78.60 @| Donaldson (1905) 
Summer flounder...... 840 | 462} 0.358} 78.98 @| Donaldson (1905) 
Summer flounder...... 860 | 453] 0.406) 78.37 @| Donaldson (1905) 
Summer flounder...... 880 | 459) 0.381} 77.11 | Donaldson (1905) 
Summer flounder...... 890 | 459) 0.417| 77.98 2} Donaldson (1905) 
Summer flounder...... 1010 | 460) 0.355) 78.22 2} Donaldson (1905) 
Summer flounder...... 1010 | 447| 0.369) 78.72 o’| Donaldson (1905) 
Summer flounder...... 1080 | 478) 0.412) 79.06 2} Donaldson (1905) 
Summer flounder...... 1290 | 505) 0.391] 78.27 2| Donaldson (1905) 
AOU ee aera S66 Balog DOO CReeel bio crore 78.45 
Mustelus canis!........ 78.5 Scott (1912) 
Barracuda eer 12 lbs. |1047| 1.554) 79.39 o'| Hatai (1917) 
Neomaenis griseus? .... 78.61 Hatai (1917) 
Cherna americana: 
Red Grouper......:. 142 lbs. | 807) 1.230} 78.80 Hatai (1917) 
Shanks Spec cn sees 160 lbs. 32.593} 80.07 o'| Hatai (1917) 
1 Average of 97 determinations from very small to very large. 
Percentage of water shows very slight variation. 
2 Average of 51 gray snappers. Range of variation is shown in table (1). 
