[ 3i6 ] 
globular in the body, while circulating ; and it has 
been (aid, that it is almoft inconceivable that fo many 
ingenious men fhould at different times have viewed 
them through a microfcope, and have concluded 
them fpherical, if they be really flat. But, however 
that may have happened, it is a fadt that they are as 
flat in the body as out of it. Of this I am convinced 
by having repeatedly obferved them whilft circulat- 
ing in the (mall velfels between the toes of a frog, both 
in the folar microfcope, and the more Ample one 
abovementioned.. I have feen them with their fides 
parallel like a number of coins laid one again!! ano- 
ther. I have likewife in that animal, where they 
are elliptical, feen them move with one end foremoft, 
and fometimes with an edge turned towards the eye. 
J have moreover feen them, when entering a fmall 
veflel, ftrike upon the angle between it and the larger 
trunk, and turn over with the fame variety of 
phafes that they have when turning over upon a 
piece of glafs,. 
Upon this occafion I may remark, that it has been 
laid by fome microfcopical obfervers, that in pafling 
through very fmall veflels they feem to alter their 
fhapes,. and to be lengthened. This conclufion, J 
fufpect, has taken its rife from the obferver having 
feen them with their edge turned towards his eye ; 
in which cafe they would appear long and fmall, as 
if lengthened by compreffion, efpecially to one who 
fets out with the notion of their being globular. I 
have feen them in blood veflels, which would admit 
only Angle veAcles, move with difficulty,, as if 
flreightened for room ; but never law them altered in 
their fliaoe by the aflioii of the veflels. 
It Jfv 
