or Red Particles of the Ma7nmiferous Anivials. 197 



tected a source of error in some of the observations. The 

 statement, therefore, formerly made (13.) is withdrawn for the 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. Mon a Monkey, [Cercopithecus Mona,) a male about 

 a third grown. Most frequent sizes of corpuscles l-SSS'tth 

 and l-3428th. Extreme diameters, l-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 1-2'tOOth, with most numerous intermediate 

 gradations. 



117. Sooty Monkey, [Cercopithecus fuliginosus), a female 

 about half-grown. All the following diameters very frequent, 

 l-3600th, l-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^SGOOth, and 1 -3423rd. Extreme diameters, 

 l-4800lh and 1 -2900th. Blood from a prick of the fore- 

 hand. 



120. Vervet 'NLonkey, [Cercopithecus pygeri/thrus,) an adult 

 male, l-3309th, l-3429th, and l-3552nd common sizes; ex- 

 treme diameters 1 -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 

 l-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 was obtained from 



