6 W. RLAXLAND BENHAM. 
very similar to that exhibited by the living subject. Further, 
these corpuscles or globules do not flow freely in the vessels as 
the walls contract, but adhere together in clumps, and some-- 
times a mass or clump will be separated by some considerable 
space from neighbouring masses, appearing to indicate a colour- 
less plasma. This massing of the globules also occurs in the 
freshly shed blood, as will be seen hereafter, but its occurrence in 
the blood-vessels is extremely peculiar, and M‘Intosh expresses 
the phenomenon by speaking of the blood as “ coagulable ”— 
a term which perhaps is scarcely true in its original sense, — 
for there is no evidence of the separation of “fibrin” or 
anything of that nature; the globules or corpuscles rather 
adhere together. 
The general shape of the corpuscles is spherical ; in size they 
average 0°002 mm. in diameter in the living condition; they 
are not amceboid; they are homogeneous, and rather oily in 
appearance. They are not nucleated, as the addition of re- 
agents will show; and I did not observe the refringent body 
within them mentioned by M‘Intosh. Nuclei, however, do exist 
in the blood, though usually in an isolated condition, and are not 
recognisable with certainty in the living worm ; but in stained 
sections, as well as in preparations treated with osmic acid, fol- 
lowed by picro-carmine, such nuclei are more or less abundant 
(fig. 4), and though usually quite deprived of any protoplasmic 
envelope, yet in some cases I noted a granular mass surrounding 
the nucleus, without any boundary or recognisable limit, and I 
believe this to be the fluid plasma of the blood, coagulated by the 
reagents. In a preparation of the blood mounted in glycerine, 
in which the globules have undergone a considerable amount of 
fusion, so that the globules are of very varied sizes, I note several 
instances of what appear to be nucleated corpuscles. In these 
cases the nucleus, of the usual size, is deeply stained, and lies at 
one side of an unstained “ globule” (figs. 8, 9); sometimes, in 
fact, the outline of the nucleus seems to project slightly beyond 
the general outline of the globule, but this may be due to the 
greater refractive index of the former. These globules, of which 
I give some figures (fig. 6), vary in size, but are much larger 
