EXPLANATION <>F PLATES. 



All these figures are drawn to a magnification of 3000 diameters and 

 are from specimens stained with iron haematoxylin. No camera lucida 

 was employed, bu1 the dimensions were obtained by measurement with 

 an eyepiece micrometer. A Zeiss, 2 mm., apochromatic objective was 

 employed, together with the 6 and 18 eyepieces. 



Pigs. 1 to 16 from the peripheral circulation. 



Pigs. 17 and 18 from the spleen. 



Pig. 1. — Typical indifferent form showing oval trophonueleus and 

 rather large kinetonucleus, with a distinct end-bead on the flagellum. 



Pig. 2.— First stage in division of kinetonucleus. 



Pig. 3. — A later stage in winch tin' chromatin lias separated in the 

 form of two bands lying across a lighter-stained area. 



Pig. -l. — Division of intranuclear centrosome and arrangement of chro 

 matin in the form of a n equatorial plate. 



Pig. 5.— Cleavage of chromatic plate into I wo halves. A new flagel 

 hun lias commenced to grow from the region of the now kinetonucleus. 



Pig. ii. — Late stage oi .livision of trophonueleus showing the chro 

 matin aggregated around each intranuclear centrosome, these latter still 

 remaining connected by a fine lino. 



Pig, ;. Commencement of division of protoplasm. 



Fig. S. — Late stage of division showing the two parasites still remain 

 g connected by their posterior extremities. 



I gs. 9 12. Trypanosomes showing successive stages in tin- pass,-,-,. ,,t' 

 chromatin from the kinetonucleus to the region of the trophonueleus. 



Pig. 13. — Trypanosome showing a number of chromatic bodies !"■ 

 t ween the two nuclei. 



Pigs. II 18. — Various stages in the formation of a cyst from the in- 

 different form of trypanosome. 



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