197 
or Red Particles of the Mammiferous Animals. 
tected a source of error in some of the observations. The 
statement^ therefore, formerly made ( 1 3.) is withdrawn for the 
present ; and I hope soon to be able to give the result of ano- 
ther inquiry on the subject. In the mean time I may mention 
that in the foetal Guinea pig at the full period of utero gestation 
the corpuscles corresponded in size with those of the mother ; 
and in a human foetus at the fifth or sixth month they were 
smaller than in the adult. 
116. Mona Monkey, {Cercopithecus Mona,) a male about 
a third grown. Most frequent sizes of corpuscles l-3554th 
and l-3428th. Extreme diameters, 1 -5333rd and 1 -2900th. 
Blood from the left coronary vein as well as from the different 
cavities of the heart. In the blood of the inferior cava vein 
the corpuscles were more variable in size, the extremes being 
l-4800th and l-2400th, with most numerous intermediate 
gradations. 
117. Sooty Monkey, (Cercopithecus fuliginosus), a female 
about half-grown. All the following diameters very frequent, 
l-3600th, 1 -3428th, l-3368th, and l-3200th. Extreme sizes 
l-5333rd and l-3000th. Blood from the left ventricle of the 
heart. 
118. Patas or Red Monkey, {Cercopithecus ruber,') a female, 
nearly full-grown. The disks most commonly l-3330th of 
an inch in diameter ; extreme sizes, 1- 4000th and 1 -3000th, 
Blood from the pulmonary artery and vein, a few hours after 
death. 
119. Crown Monkey, ( Cercopithecus pileatus, ) a male about 
two-thirds grown. The following the most common sizes ; 
l-3635th, l-3600th, and 1 -3423rd. Extreme diameters, 
l-4800th and 1 -2900th. Blood from a prick of the fore- 
hand. 
120. Vervet Monhey, {Cercopithecus pygerythnis,) an adult 
male, l-3309th, l-3429th, and l-3552nd common sizes ; ex- 
treme diameters l-4000th and l-2900th of an inch. Blood 
from a wound at the end of the tail. 
121. Dog-faced Baboon, {Cynocephalus anuhisl) a female 
about half-grown. The dried corpuscles l-3600th, l-3530th 
and l-3428th generally; extreme diameters l-4000th, and 
l-3000th. In the serum there were several disks exactly of 
the same magnitude, besides many of smaller size, viz. about 
1 -5333rd of an inch in diameter. 
The blood was procured from a wound of the tail, and ex- 
amined in less than two hours afterwards. The shrinking of 
some of the corpuscles in their own serum is well exemplified. 
In another dog-faced Baboon (1.) the corpuscles were a little 
larger ; but as in that instance the blood w^as obtained from 
