JOURNAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



DECEMBER 1886. 



TRANSACTIONS OF THE SOCIETY. 



XIII. — Flagellated Protozoa in the Blood of Diseased and 

 apparently Healthy Animals. 



By Edgar M. Crookshank, M.B. Lond., F.R.M.S. 



{Read 10th November, 1886.) 



Plate XVII. 



In the year 1880 Dr. Evans presented a Report * to the Indian 

 Government on a fatal disease, known by the natives as Surra, 

 occurring in horses, mules, and camels. The importance of this 

 disease may be realized from the fact that the 3rd Punjab Cavalry 

 alone lost no less than 300 horses from it. 



The malady was described as a blood disease, characterized by 

 fever accompanied by jaund:ee, petechias of mucous membranes, 

 great prostration, and rapid wasting terminating in death. The 

 average duration of the disease was estimated at two months. No 

 organic lesions were found after death, but a parasite was dis- 

 covered by Evans in the blood during life. By means of subcu- 

 taneous inoculation and by the introduction into the stomach 

 of blood containing the parasites, the disease was transmitted to 

 healthy animals. 



EXPLANATION OF PLATE XVII. PHOTOMICROGRAPHS OF 

 THE "SURRA" PARASITE, (x 600.) 



Taken on isochromatic plates, with Zeiss's 1/18 Horn. Imm. without eye-piece 

 from a preparation stained with magenta. Photos 1, 2, 3, show the general form of 

 the organism; 4, 5, 6, the undulating membrane on the upper edge; 7, the 

 organism distorted and truncated at one end ; 8, attached to a blood-corpuscle ; 9, 

 doubled over, the membrane appearing on the lower edge; 10, 11, two; and 

 12, three organisms fused by their non-flagellated ends. 



* Report published by the Punjab Government Military Department, 

 No. 439, 1880. 



Ser. 2.— Vol. VI. 3 O 



