SpitzKa, Brain-Weights of Animals. 15 
The following list contains the fresh weight of the body 
but not of the brain, this organ having been removed some 
time after a zinc chlorid solution had been injected into the 
body : 
Zn Cl2 
Sex| Body-W’t}Brain-W’t 
Macacus rhesus, 1866 97-5 
“ as 2069 86 
“6 “6 1490 85 
‘es 66 1640 80 
«6 ‘6 805.5 78 
46 66 978 69 
Cercocebus albigena, 1991 76 
Cercocebus fuliginosus, 2561 94 
Gercopithecusreallitrichusys) 130), econ eeee 65 
“cc “cc 1629 75 
Cebus albifrons, 1640 80 
Cebus capucinus, 1409 69 
ANALYSIS OF 80 FRESH BRAIN-WEIGHTS OF THE GENUS MACACUS. 
Macacus rhesus. Among the 57 specimens there are 25 
of males, the same number of females, and 7 of which the sex 
is not recorded. The body-weight is wanting in the case of 
one of the males. Twenty of the males weighed over 1000 
grammes each, and 22 of the the females. Only one of these, 
a male weighing 5190 gms., with a brain-weight of 93 gms., 
can be considered a full-grown adult; the ratio is 1:56 and is 
doubtless much nearer the true adult ratio than any of the 
others in the list. The cases are tabulated according to sex, 
and average brain- and body-weight in the following table: 
TABU «iL 
Macacus Rhesus. 
Total Total Averages. 
No. of )Range of Body-| Body- Brain- Body- Brain- 
Sex. Cases Weight. Weights. |Weights. | Weight. | Weight. 
Males 20 (1079-5190 gms)| 34926.0 1615.5 1746.3 80.77 
1 4 |( 744- 912 “* )| 3448.0 303-0 861.0 75-75 
Females 22 (1106-2286 ‘* )| 35659.5 1725.0 1620.9 78.40 
“ 3 ( 877- 974 ‘* )| 2811.0 221.5 937.0 73.80 
(?) 7 j(1180-2180 ‘* )| 12485.0 566.0 1783.4 80.90 
Male I | Wee a see saan coaloneeen ees Te OM eee oe 72.00 
