450 J. K. BRADFORD AND H. G. PLIMMEU. 



I. Nomenclature. 



In our preliminary paper ^ on the organism found in the 

 Tse-tse fly disease Ave suggested Trypanosoma Brucii as 

 a suitable and appropriate name for it. But after this 

 La,veranj in his papers on this organism, gave it the name 

 Herpetomonas Brucii, which apparently he considered 

 to be a more accurate designation biologically. However, 

 in a recent paper by Laveran and Mesnil," discussing these 

 terms from a morphological point of view, they show that 

 Trypanosoma is a more accurate term than Herpetomonas ; 

 in fact, that this latter term ought to disappear altogether, 

 and that the generic name Trypanosoma ought to be used to 

 designate all those flagellated organisms at present known, 

 which are parasitic in the blood of vertebrates. Hence we 

 shall retain the name we used in our paper above mentioned, 

 as being probably the more accurate one. 



II. The Adult Form of the Trypanosoma Beucii. 



A. Examined in the Living State. — The adult form 

 of the Trypanosoma can be easily studied in the fresh blood 

 of an affected animal, by placing a drop on a slide and 

 simply covering it with a cover-glass, and examining it with 

 an objective of suitable power. But, as these organisms are 

 extremely delicate, and are very easily broken up by slight 

 pressure, it is better to make a very thin cell, by running a 

 small drop of melted paraffin on to a slide in the form of a 

 ring or squai'e, by means of a red-hot platinum loop, and to 

 place the drop of blood in the centre, covering it with a 

 cover-glass, which must be sealed with paraffin, in order to 

 prevent evaporation, if the blood is to be examined for any 



' " A Preliminary Note on the Morphology and Distribution of the Organism 

 found in the Tse-tse Fly Disease," by H. G. Plinimer and J. Rose Brad- 

 ford, F.R.S., ' Proc. Roy. Soc.,' vol. Ixv, p. 274. 



- " Sur la structure du Trypanosome des grenouilies et sur I'extension du 

 genre Trypanosoma, Gruby ; par Laveran et Mesnil, 'jComptes rendus de 

 la Societe de Biologic,' tome liii, No. 23. 



