ITS DIFFERENT PHASES OF DEVELOPMENT IN THE ANIMAL SERIES. 93 
yellow fluid which exuded when a small wound was made in the body of the 
animal. 
31. In this fluid there were recognised, amidst a number of other corpuscles the 
nature of which will be inquired into below, corpuscles corresponding in essential 
characters to the granule and nucleated blood-cells of the Crab and Spider. 
32. Granule Blood-cells. — These were, when seen immediately on the blood being 
drawn, of an elliptical or oval shape (fig. 1.), but they soon became round. In this 
state some might be seen with the cell-wall shot out into small cilia-like processes 
(fig. 2.). By the action of water, the cell becoming distended, these processes dis- 
appeared (fig. 3.). 
33. The size of the cells under consideration was on an average ^ oV uth °f an inch 
long by 4 trooth broad. 
34. The cells were most of them pale-looking, but some presented coarser and 
more refracting granules than others. 
35. Nucleated Blood-cells. — These were much more numerous than the granule 
blood-cells. When the blood was first examined on being drawn, the cellseform 
nucleus, of an oval shape, measuring 3 - 6 x 5 -oth by about Wo oth of an inch, and 
reddish in its interior, was the part most distinctly seen. The cell-wall, which 
might sometimes be seen of an elliptical shape (fig. 4.), was in general already 
found shrivelled and collapsed around the cellseform nucleus, or shot out into pro- 
cesses (fig. 5.). It was extremely pale and not always very readily distinguished. 
On the addition of water, however, it became distended and was then pretty distinctly 
seen (fig. 6.). In this state it was circular and measured about °f an inch in 
diameter. 
36. In regard to the other kinds of corpuscles contained in the blood of the Beetle, 
they were, 1st, — a few corpuscles resembling the cellseform nuclei of the nucleated 
cells, but around which no cell-wall could be detected ; 2nd, some oil-globules ; 
3rd, a great number of elementary granules in size from about Toooth of an inch in 
diameter downwards, the larger being biconcave, circular, and of a yellowish or 
reddish colour. 
Blood-corpuscles of the Chrysalis of the Cabbage Butterfly. 
3 7 - The matter examined as blood was the clear green fluid which flowed out on 
slight pressure, when a small point of the anterior end of the chrysalis was snipped 
off. 
38. In this fluid there were both granule-cells and nucleated cells (figs. 7, 8, 9, 10, 
11, 12.), together with elementary granules. 
Examination of the Blood-corpuscles of Annelida. 
39. As examples of Annelida, I have taken the common Earth-worm and the 
medicinal Leech. 
