614 
(i. H. DREW. 
blue stain. In fresli unstained preparations they can often 
be distinguished by their small size, almost spherical shape, 
and somewhat high power of refraction. 
Differential counts gave the following as the average rela- 
tive proportion of the corpuscles : 
Finely granular eosinophil . . .48 per cent. 
Coarsely granular eosinophil . . . 44 ,, 
Basophil ...... 8 ,, 
The Process of Agglutination of the Corpuscles, and its 
Relation to the Healing of Wounds. 
The small white floccular masses produced when the freshly 
drawn blood is shaken in a tube, consist of a number of 
corpuscles which have coalesced to form a compact mass ; the 
individual corpuscles are still distinguishable, and those 
round the periphery of the mass protrude pseudopodia. This 
coalescence of the corpuscles also occurs when the fresh blood 
is stirred with any foreign body, or when the corpuscles come 
into contact with any rough surface. If the blood be care- 
fully collected by a pipette with well-rounded ends, and 
dropped on a slide, there will be comparatively little aggluti- 
nation of the corpuscles, but if the pipette be at all dirty, so 
as to present a rough surface to the blood, or if the end of 
the pipette be at all jagged, there will be considerable 
coalescence. 
When the blood is allowed to flow through a meshwork of 
cotton-wool, nearly all the corpuscles will stick to the strands 
and form dense agglutinated masses; if glass-wool be employed 
instead of cotton-wool, this result is not so marked. 
It seems possible that this power of agglutination depends 
on some change produced in the corpuscle by the stimulus of 
contact or friction with a non-living body. 
This agglutination can be studied more fully in the plasti- 
cine cell already described. If the blood be drawn through 
the small opening, a clot of corpuscles will soon be formed, 
which will close the opening, and so prevent further escape 
