JOUENAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



APRIL, 1912. 



TRANSACTIONS OF THE SOCIETY. 



III. — The President's Address : On Certain Blood Parasites. 

 By H. G. Plimmer, E.R.S. 



(Bead January 17, 1912.) 

 Plates I. and II. 



In accordance with custom your President has each year to inflict 

 upon you an addj'css. It would, of course, be most appropriate if 

 I could give you — as has often been done from this Chair — a resume 

 of the year's microscopical work, but I could not add a jot to the 

 exposition of the papers you have heard, nor to the clearness of the 



EXPLANATION OF THE PLATES 

 Illustrating Types mentioned in the Paper.* 



Fig. 1. — Embryo filarise, in the blood of Spider-monkey, x 120. Three very long 

 filarise are seen, together with red corpuscles and a number of leuco- 

 cytes. 



,, 2. — Flagellate of Trichomonas type, found in blood of Leopardine Snake. 

 X 1000. 



,, 3. — Trypanosome in the blood of a Marsh Bird, x 750. At the upper end a 

 definite micronucleus can be seen, and at the lower end the stumpy 

 tail. The body of bird trypanosomes is very dense, and the detail 

 cannot be made out in a photograph. 



,, 4. — Plasmodium prsecox in the blood of a Long-tailed Glossy Starling, x 450. 

 In many of the cells the earliest stages, in the form of a dot, can be 

 seen ; in others, later plasmodial stages. 



„ 5. — Hsemoproteus danilerosky, in the blood of a Brown-necked Parrot, a is 

 a normal erythrocyte, bbb are erythrocytes with early intracellular 



* The photograpt!S were taken from my specimens by Dr. Albert Norman, and the drawing 

 was made to scale by Mr. W. P. Berridge. 



April 17 th, 1912 L 



