260 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. II. 



Fig. 1$, a and d. Two hsematoblasts from the heart cavity of a very young Ambly- 

 stoma larva (not free swimming). Chromic acid, H aematoxylin, Eosin. x 1250. 



Figs. 16 and 17, a and b. Amoebiform hsematoblasts from heart cavity of a very 

 young larva (not free from envelope). The chromatin is very dense in the nuclei. 

 The cavities in the cytoplasma were occupied by yolk spherules. 



Flemming's Fluid, Alum-cochineal — X900. 



Figs. 18 and 19. Two hsematoblasts from the heart cavity of very young larva (not 

 free swimming). Cavities in cytoplasma occupied by yolk spherules. Fig. 19 repre- 

 sents a more fully developed corpuscle with well defined contour and abundant 

 chromatin. Chromic acid, Haematoxylin, Eosin — •X1250. 



Fig. 20, a and b. Two hnematoblasts, from a very young larval Ainblystoma, with 

 definite elliptical outlines, uncolored cytoplasma and the nuclei abundantly provided 

 with chromatin. Chromic acid, Hcematoxylin, Eosin — X900. 



Fig. 21, fl and b. Two htematoblasts from larva of same age as in last case. Flem- 

 ming's Fluid, Alum-cochineal — X1200. 



Fig. 22, a—f. Different forms of fusiform corpuscles met with in the same cover- 

 glass preparation of Necturui blood, — b was fixed while exhibiting, apparently, the 

 slow vibrator)^ motion of its thorn-like prolongations. Corrosive sublimate, Haema- 

 toxylin, Fosin — X 1,000. 



Fig. 23, a — d. Fusiform corpuscles of Net f urns' blood exhibiting various intra 

 nuclear arrangements of its chromatin. Cover preparation, Picric acid, Safranin. 



Fig. 24, a and b. A h^ematoblast (?) seen at two different optical planes exhibiting 

 the peculiar yellowish granules (hremoglobin?) apparently like those described by 

 Cuenot as secreted from the nucleus— a, at the plane passing through the upper 

 surface of the nucleus, b, at the plane passing the centre of the nucleus. There is very 

 little cytoplasma in this cell. Fresh — Xiooo 



