C 257 ] 
none of them vlfible ; almoft all the globules or rings, 
as I mufl: now call them, had, upon drying, formed 
themfelves into perfect circles. The moft complete 
and fatisfadory view I had of them in this dried 
ftate, was with a magnifier that encreafed the dia- 
meter 640 times j tho’ the perforation was diftin- 
guifhable even with one which encreafed it only 129 
times. In many places the globules had, by the 
drying of the whole drop, united into a clofer body, 
and feem’d as if cemented together by a grumous 
fubftance of a blackilh or deep red colour, which 
pofiefied and filled up all the exterior fpaces form’d 
by the union of fo many circular bodies j but the ' 
interior fpaces or perforations of the rings were ftill 
free, and for the moft part diftindly vifible, fome 
few places excepted, where the globules feem’d to 
have united over one another, and not only lay in 
too much confufion to give room for any proper ob- 
fervation of them, but formed alfo a body too denfe 
to tranfmit the light. The grumous fubftance above- 
mention’d, as it extended itfelf along the exerior 
fpaces, had the appearance of a ramification ; and it 
was perhaps in fome fuch ftate that the globules were 
view’d by Dr. Adams, whofe glaftes induced him to 
fufpe( 5 t the truth of the common opinion, that -the 
blood confifted of globular particles, and to deferibe 
them rather as imitating the branches of a tree. See 
his Remark on Blood, in Jones’s Abridgment of the 
Philofophical Tranfadions, vol. IV. p. 204. 
L I 
VoL. LV. 
A Letter 
