174 - ROBERTS, ON BLOOD-CORPUSCLES. 
projections were seen; and as rarely a corpuscle was devoid 
of any. 
The projections were commonly round or dome-shaped, 
bordered with a deeply refractive outline. Frequently a 
ie, 2. 
wl 
Human blood after the action of tannin. 
a. Double pullulation. 
b, b. Hooded modification. 
c. Outline of the cell seen continuously through the pullulation. 
d. Bursting of the pullulations independently of destruction of the cell. 
minute, apparently vesicular body could be seen within this 
outline, and then the projection presented a curiously hooded 
aspect. (Fig. 2, 6,5.) In a urinary deposit from a lad twelve 
years of age, containing pus and blood, nearly every blood- 
disc. presented the hooded appearance after the addition of 
tannin. 
The blood of the fowl, turkey, duck, and goose, showed 
exactly analogous phenomena with the same reagent. (See 
fig. 3.) 
The projection had sometimes the hooded character with a 
vesicular body within; sometimes the projection offered no 
such distinction of parts. It was situated indifferently on any 
part of the periphery. In all the birds examined a second 
projection was as rare as im mammalia. 
