[ 3°8 ] 
his fpeculative opinions, or his theory, that dif- 
fers from what I have difcovered by thefe expe- 
riments. 
In plate XII. it appears, that of all the animals 
which I have examined, the particles are larged: in 
the fifh called a fkate ; next to the fkate they are 
largeft in a frog and a viper, and other animals of 
this clafs ; they are fomewhat fmaller in the com- 
mon fifh, as the falmon, cod, and eel. In birds 
they are fmaller than in fifh ; in the human fubjedt 
fmaller than in birds ; and in feme quadrupeds ftill 
fmaller than in the human fubjedt. JLeeuwenhoeck, 
ipeaking of their fize, fays, he is confident the red 
particles of the blood are no larger in a whale than 
in the fmalleft fifh A And others- have, fince his 
time, faid they are of the fame fize in all animals 
but it is evident, from comparing their fize, as deli- 
neated in the abovementioned plate, that it differs 
confiderably, and that they are not largeft in the 
largeft animals ; for we find that in an ox they are 
not fo large as in a man ; and fo far are they from 
being larger in the whale than in the fmall fifh, it 
appears probable, from comparing their fize, as de- 
lineated p’ate XII. N° II. from a porpus, which 
belongs to the fame genus as the whale, that they 
are fmaller in thofe animals than in fifh.. Neither 
is their fize inversely, as the fize of the animal ; for 
they are as large in an ox as in a moufe. The differ- 
ence in their fize therefore depends on fome other 
dreum fiance than a difference in the fize of the: 
animal. 
* Conf. Arcan. Nat. p. 220# 
As 
