504 SUMMARY OF CURRENT RESEARCHES RELATING TO 



protoplasmic purification and a renewal of the power of immunisation. 

 It is antagonistic to senescence, and this idea is extended to the Metazoa 

 as well. 



New Vorticellid.* — W. Ayrton describes Zoothamnium geniculatum 

 sp. n., which he found attached to weeds in the river Waveney, Suffolk. 

 It is an exceedingly beautiful arborescent colony with dimorphic zooids, 

 very like Z. arbuscula, but with distinctive features of its own. 



New Species of Trachelomonas.t — T. Chalkley Palmer describes 

 five new species of this genus, which though apparently not infrequent 

 or wanting in variety, has not been studied with any great degree of 

 enthusiasm. The new forms were obtained from Ancora, New Jersey, 

 in a diatomaceous film. The five species are established solely on the 

 strength of the characters of the lorica, which was in all cases siliceous. 



Trypanosoma found in Sleeping Sickness.:}: — A. Castellani found 

 in the blood and in cerebro-spinal fluid of patients suffering from 

 sleeping sickness, a species of Trypanosoma differing from. Tr. gambiense 

 Dutton in the position of the micronucleus, the vacuole, and the 

 flagellum. Though the structural differences are far from being con- 

 stant, the author is inclined to think that the form described is a new 

 species. Just as the horse is liable to be infected with Tr. brum 

 (" nagana "), Tr. evansi (" surra "), and Tr. equiperdum (" dourine "), 

 so man may be attacked by different species giving rise to different 

 diseases. 



• Journ. Quekett Micr. Club, 1903, pp. 407-10 (1 pi.). 



t Proc. Acad. Nat. Sci. Philadelphia, 1902, pp. 791-5 (1 pi.). 



X Brit. Med. Journ., No. 2216, June 20, 1903, pp. 1431-2 (1 fig.). 





* I ^ »>4- 



