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Fig. 16. Elongated form witLout evident flagellum. Karyosome shows within the 
nucleus. Length 9 "5 /x. 
Fig. 17. Typical flagellate form. Size 7 x 2 /r. 
Fig. 18. Another and larger typical flagellate form. Size 14 x 1 /r. 
Fig. 19. Small curved forms. Size 5 x 2 /r. 
Fig. 20. Dividing forms without flagella. Size 5 x 2 /r. 
Fig. 21. Dividing flagellate form. Karyosome in division. Size 10 x 2‘8,u.. 
The sore parasite (Leishmania tropica). 
Figs. 22-29 fi-om dried smears made direct from the sore and stained hij Giemsa’s stain. 
Fig. 22. Torpedo-shaped parasite with the kinetonucleus closely applied to the nucleus. 
Such a position of the two nuclei may lead to the erroneous idea that a fusion of these 
has taken place. The rhizoplast running towards the blunt extremity of the body is 
clearly shown. 
Figs. 23 and 24. Two similar parasites with the kinetonucleus not so closely applied to 
the nucleus. These torpedo-shaped parasites are mostly extracellular. 
Fig. 25. Typical parasite from the sore. The two parts of the kinetonucleus show well, 
one deeply and the other lightly staining. The rhizoplast arises from the pale 
staining part. Length 2-5 /x. 
Fig. 26. Another and larger parasite in division. The pale half of the kinetonucleus 
shows up clearly. The new rhizoplast is already formed though it is still smaller 
than the original one. Length 5 fx. 
Note. These parasites (Figs. 25 and 26) which are from dried films stained by 
Giemsa’s stain, should be compared with the similar parasites stained by Heidenhain’s 
iron haematoxylin method in films fixed in Schaudinu’s fixative without any drying. 
Such forms are shown at PI. XIII, figs. 9 and 15. 
Figs. 27 and 28. Two abnormal forms without nuclei. Many of these are to be found in 
the smears from the sore. 
Fig. 29. Form with dividing nucleus. 
Figs. 30-36. From cultures of the sore parasite on rabbit’s blood agar. 
Fig. 30. Cultural form showing dividing karyosome in nucleus and dividing kinetonucleus 
connected with which is the pale staining dome-shaped structure from the apex of 
which the flagellum springs. Length 11 /x. 
Fig. 31. Similar form with the dome-shaped structure on the kinetonucleus. A second 
rhizoplast is forming. Length 10 /x. 
Figs. 32 and 33. Two parasites in division. They show well the kinetonucleus with its 
dome-shaped structure which divides with the kinetonucleus. The second rhizoplast 
is a new formation. Size 8x5/x. 
Fig. 34. Division form showing the dividing karyosome and kinetonucleus with its dome¬ 
shaped structure and newly-formed rhizoplast. Length 7 /x. 
Fig. 35. Typical cultural form. The connection of flagellum to kinetonucleus is well 
shown. Length 12 /x. 
Fig. 36. Form showing the kinetonucleus with a deeply staining dividing structure 
within it. 
Figs. 37-41. Developmental forms of the sore parasites in Stegomyia fasciata. 
Fig. 37. From a Stegomyia fasciata which had fed from the sore on ten successive days 
and was dissected forty-eight hours after the last feed. 
Figs. 38, 39, 41. From a Stegoniyia fasciata which had fed from the sore on four 
successive days and was dissected twenty-four hours after the last feed. 
