296 



Notes on the Genus Toxoplasma. 



Fig. 4. — From exudation from lung, showing three free toxoplasmas to the right, and 



to the left a mononuclear leucocyte, with a hyperchromatic nucleus, containing 



parasites, two apparently in late stage of division. 

 Fig. 5. — From same exudation, showing three free toxoplasmas at upper part, a large 



mononuclear leucocyte containing one parasite on right, and a similar cell containing 



several on the left. 



Fig. 6. — From blood from lung, showing a lai-ge mononuclear leucocyte containing 



several toxoplasmas. Below the hyperchromatic nucleus can be seen two parasites 



with ring-shaped nuclei. 

 Fig. 10. — Drawing made from fresh unfixed specimen of exudation from Fruit Pigeon's 



lung. 1. Ordinary toxoplasmas. 2. Form with nucleus in form of granules. 



3. Large mononuclear leucocyte containing parasites. 4. Probably an early stage 



of schizogony. 



Figs. 7-9, from Sat's Snake. 



Fig. 7 fixed in vapour of iodine dissolved in chloroform and stained with alkaline 

 Giemsa's stain. Fig. 8 fixed by method of Carnoy-Lebrun and stained with Weigert's 

 hstmatoxylin. Fig. 9 fixed as Fig. 8 and stained with alkaline Giemsa's stain. Photo- 

 graphed x 1000. 



Fig. 7. — From liver, showing a fusion of three large mononuclear cells containing a 

 number of parasites. It will be noticed that the toxoplasmas lie in vacuoles, and 

 that they are larger than those in either the mammal or the bird. 



Fig. 8. — From liver, showing one very distended mononuclear leucocyte, with nucleus 

 about to break up, and with very delicate frothy protoplasm, apparently about to 

 give way, containing 14 parasites, each lying in a distinct vacuole. 



Fig. 9.- — A section from the liver, showing several free toxoplasmata in lower part, and 

 above what is probably a later stage of schizogony than that shown in Plate 9, fig 3, 

 as the shape of the parasites is more defined. 



