ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 447 



Biology of Piroplasma canis.* — G. Nuttall reviews the known facts 

 of geographical distribution, pathological effects, and mode of dissemi- 

 nation of Piroplasma canis. Cattle, sheep, horses, and man all serve as 

 hosts for this parasite. It occurs in the blood in all parts of the body, 

 most abundantly in the internal organs, within the blood-cells, and also 

 free in the plasma. The author infected dogs in England, where piro- 

 plasmosis does not occur, through the medium of ticks (Hccmophysalis 

 leachi), the reputed intermediate host in Africa. 



Trypanosomes of Nagana and Mai de Caderas.f — W. L. Jakimoff 

 finds that infection with these parasites causes very acute sickness in 

 mice and rats ; ih dog, fox, guinea-pig, rabbit, and cat, the disease is 

 slower, lasting from one to six weeks ; frogs and pigeons are immune. 

 The virulence of the trypanosome is increased by frequent passage 

 through the animal organism, while extremely small numbers are suffi- 

 cient to accomplish infection. Besides the blood, the cerebro-spinal 

 fluid, pleural, peritoneal, and pericardial exudations, as well as other 

 body fluids contain the infection substance. House-flies do not act as 

 transmitters of these diseases. 



Leucocytozoan of the Dog. J — @. A. Bentley describes what seems 

 to be a new and hitherto undescribed parasite of the leucocytes of the 

 dog. The subjects were of English breed, born in Assam, and showed 

 a slight anasmia, and some little febrile disturbance. It may be that the 

 parasite is a Hsemogregarine, which would be remarkable in the blood 

 of a mammal and in the leucocytes thereof. 



Coelosporidium Blattellae.§ — Howard Crawley describe* this new 

 Sporozoon, one of the Haplosporidia, which occurs in great abundance 

 in the Malpighian tubules of the so-called Croton bug, Blattella ger- 

 manica L. He gives an account of its life-cycle as far as he has been 

 able to trace it. 



Diseases of Fishes. || — 0. Fuhrmann discusses in a brief note the 

 causes of some of these. Diseases due to bacteria and sporozoa are 

 furonctdose of Salmonids, the loosening of scales in white-fish, bubonic 

 disease of barbels, and small-pox of carp. An interesting epidemic 

 malady of the female sexual organs of the pike of Lake Neuchatel is 

 caused by a myxosporidian (Henneguya psorospermica var. oviperda). 

 The disease destroying carp is probably caused by a parasite of the 

 genus Trypanosoma, which causes sleeping sickness in man. 



Pseudo-Hsematozoa.lF — A. Laveran directs attention to a number of 

 appearances which may be, and have been, mistaken for intra-corpuscular 

 Ha3inatozoa, e.g. (1) vacuolated corpuscles, common in anaemic subjects; 

 (2) nucleated corpuscles, also frequent in anasmia ; (3) granular 

 (" mouchetee ") corpuscles ; and (4) hasmatoblasts. 



* Jouru. Hy K ., iv. (1904) p. 219. 



t Centralbl. Bakt. Parasitenk.,xxxvii. (1904) pp. 668-78. 



X Brit. Med. Journ., May 6, 1905, p. 988 (2 figs.). 



§ Proc. Acad. Nat. Sci. Philadelphia, 1905, pp. 158-61 (6 figs.). 



|| Arch. Sci. Phys. et Nat., xix. (1905) p. 205. 



i Cuiiiptes Rendos, cxc. ( 1905) pp. 121 1-16 (4 figs.). 



