TFIE TUYPANOSOMA BHUCII. 465 



Laveraii^ states that the Trypanosoma of Nagana has 

 the same structure as that of the sewer rat Trypanosoma 

 but that it is a little longer. This latter fact is quite correct, 

 but it Avill be seen from the above that there are other very 

 noticeable differences of structure between them. 



VIII. The Microndcleus. 



There seems at present to be much uncertainty as to 

 what the exact zoological title of this body should be, to 

 which we gave the above provisional name in our first 

 paper. 



In the article by Laveran on the multiplication of the 

 sewer rat Trypanosoma, which we have mentioned above, 

 he uses the term blepharoplast for this body, as being 

 the most accurate one. This term, he says, was employed 

 by Webber to designate analogous bodies in vegetable 

 cells. This term is used to express a body having the 

 reactions of chromatin, to Avhich an undulating membrane, 

 or flagellum, is attached, or from which they take rise. 

 Kabinowitch and Kempner^ called this body a nucleolus, 

 and Wasielewski and Senn^ gave it the name of Geissel- 

 wurzel (root of flagellum). Henneguy ^ has stated in an 

 earlier paper that the blepharoplast is of the nature of a 

 centrosome, i.e. a centrosomal structure to which a flagellum 

 is attached, or from which it arises. 



From our observations on the Nagana Ti'ypanosoma 

 we are obliged at present to adhere to the provisional title 

 of micronucleus. We have seen it apparently coming off 

 from the macronucleus, as shown in fig. 23, and we have 

 seen it fuse with the corresponding body in another 

 organism, as we have described above under the heading 



' "Sui- le mode de multiplication du Trypaiiosome du rat," l.averau et 

 Mesiiil, 'Comptes reiidus de la Socicte de Biologie,' tome Hi, No. 35. 

 - 'Zeitschr. f. Hygiene u. Infectiouskr.,' 1899. 

 s Ibid., 1900. 

 * 'Arcli.d'Anul. Microsc.,' 1897- 



