DEVELOPMENT OF PARASITE OF ORIENTAL SORE. 747 
The Development of the Parasite of Oriental 
Sore in Cultures. 
By 
R. Row, M.D.Lond., D.Sc.Lond. 
With Plate 20. 
[THe following memoir is made up from two communica- 
tions, dated respectively December, 1908, and January, 1909, 
which I received from Dr. Row. Each letter was accom- 
panied by sketches and stained preparations ; from the latter 
the figures on Pl]. 20 have been drawn by my assistant, Miss 
Rhodes, at the Lister Institute. The account given here is, 
for the most part, in Dr. Row’s own words; any remarks of 
mine are in square brackets. 
The parasites causing oriental sore were first described 
accurately by Wright (‘Journ. Med. Research, vol. x, 1903, 
p- 472), and named by him Helcosoma tropicum. On 
account of their obvious affinity (which the present memoir 
confirms) with the Leishman-Donovan bodies of kala-azar, 
Wright’s bodies have been referred by subsequent writers 
(compare Lithe in Mense’s ‘Handbuch der ‘ropenkrank- 
heiten,’ 11, 2, 1906, p. 203) to the previously established genus 
Leishmania Ross (‘ Brit. Med. Journ.,’ 1903, vol. i, pp. 1261 
and 1401), and they now stand as Leishmania tropica 
(Wright), the only other known species of the genus being 
L. donovani (Lav. et. Mesn.), the parasite of kala-azar. 
It was first discovered by Rogers (‘ Quart. Journ. Micr. 
Sci.,’ vol. 48, 1904, p. 367), and confirmed by many subse- 
quent observers, that L. donovani gives rise in cultures toa 
flagellate Herpetomonas-like form. So far as I am aware 
