and Circulation of the Blood. 129 
Times fewer in Proportion to its Serum 
than in any other Land or Water-Animal he 
had ever before examined* 
At the proper Time of Tear, exceeding 
fmall Crabs may be found in great Abun¬ 
dance, under Stones and Brick-bats, on the 
Shore of the River 'Thames , when the Tide 
is out: and as many of them are no larger 
than a little Spider, it is highly probable fuch 
may be transparent in many Places of the 
Limbs and Body ; notwithflanding Mr. 
Leeuwenhoek found his, which were an 
Inch broad, opake every where but in the 
extremeil Joints of the hinder Legs. Per¬ 
haps too they may appear more tranfparent 
if they are applied to the Microfcope in a 
little Tube filled with Water, than if they 
are viewed dry : for it is obfervable, that 
many Objedts acquire a Tranfparency by be¬ 
ing wetted, in the fame Manner as Paper 
becomes clear by being rubbed With Oil. 
The Blood may be feen circulating in the 
Legs and Tails of Shrimps , efpecially if view¬ 
ed in Water; but then the Water muff 
have a little Salt put thereto, or elfe they 
will foon expire. In Shrimps the Blood is 
not red ; which has given Occaiion to call 
them, as well as many other Infects, exangues , 
or bloodlefs ; tho* in reality no living Crea¬ 
ture is without Blood; for animal Life con- 
fifts in a Circulation of fome Fluid through 
K 4 Arte- 
