184 SUMMARY OF CURRENT RESEARCHES RELATING TO 



siderable numbers on the third and fourth days. These small forms 

 grow and divide again. Divisions take place by mitosis ; the flagellum 

 functions similarly to the centrosomes of other cells. 



Chromidia of Protozoa.* — R. Goldschmidt discusses the nuclear 

 material distributed in the plasma of Protozoa, to which R. Hertwig 

 applied the term Chromidia. It seems to be of a two-fold nature — (1) 

 material of trophic function, corresponding to the macronucleus of 

 Ciliata (Mesnil's f " trophochromidia ") ; (2) material of reproductive 

 function, corresponding to the micronucleus of Ciliata (Mesnil's " idio- 

 chromidia," Goldschmidt's " Sporetia "). Both Goldschmidt and Mesnil 

 point to the probable duality of the nucleus in general. 



Studies on Sarcodina. $■ — E. Penard discusses some fungoid para- 

 sites of Amaiba ; the occurrence of uninucleate, binucleate, and multi- 

 nucleate specimens of Amoeba granulosa Gruber ; Dinamotba mirabilis 

 Leidy, which is sometimes much infested with microbes ; Cochliopodium 

 crassiusculum sp. n., adapted to terrestrial life ; Paulinella chromatophora 

 Lauterborn, remarkable in its envelope and chromatophore ; Placocysta 

 jurassica sp. n., and Arachnula vesiculata sp. n. 



Pathology of Balantidium Coli.§ — R. P. Strong has found in 

 Manila that in 91) * 1 p.c. of the cases (117) of human intestinal infection 

 with B. eoli, diarrhoea was a prominent symptom. In two cases 

 histological studies showed that the parasites had invaded the coats and 

 vessels of the large intestine. Hogs as well as human beings have 

 been found infected in Manila. Later researches by other investigators 

 confirm the foregoing, and though it has not been demonstrated that 

 B. coli produces a primary erosion of the intestine, if such exist, it is 

 certainly capable of continuing the process, and of modifying and pro- 

 ducing, in connection with the bacteria which accompany it more or 

 less characteristically pathological lesions. 



Piroplasma Canis.|| — G. H. F. Nuttall and G. S. Graham-Smith 

 describe and figure this parasite as observed in stained preparations 

 obtained in infection experiments carried on in Cambridge with infected 

 ticks (Hczmaphy sails leachi Andouin) imported from South Africa. 

 The appearance and size of the parasite, its multiplication within the 

 cell, and free and doubtful sexual forms, are described. The paper is an 

 important one, and contains much matter of interest regarding these 

 imperfectly known Protozoa. 



Piroplasma in Monkey.f — P. H. Ross gives an account of a 

 piroplasma from the blood of Cercopithecus. Fourteen specimens were 

 examined, all their temperatures were high, and in every case the blood 



* Arch. Prot., v. (1904) pp. 126-44. 



t Bull. Inst. Pasteur, iii. (1905) 10 pp. (7 figs.). See Zool. Zentralbl., xii. (1905) 

 p. 422. 



J Rev. Suisse Zool., xiii. (1905) pp. 585-616 (2 pis.). 



§ Dept. Intern. Bureau of Gov. Lab., Manila, 1904, pp. 1-75 (5 pis.). 



|| Joum. Hygiene, v. (1905) pp. 237-49 (1 pi.). 



■jf Tom. cit., pp. 18-23. 



