452 SUMMARY OF CURRENT RESEARCHES RELATING TO 



did not hasten growth. Gelatin was always liquefied, and pigment 

 always apparent. The presence or absence of light seemed to exert no 

 influence on colony formation. The reaction of nutrient media, neutra- 

 lised with normal caustic soda, was always slightly acid. In hanging 

 drops movements were observed, but flagella were not made out. Spore 

 formation was not observed. In the seeds bacteria were not discovered, 

 hence the bacteria in the roots must have found their way in from the 

 soil. 



Bacteriosis of Walnut.* — Under the name Pseudomonas Juglandis 

 sp. n., Prof. Newton B. Pierce describes a micro-organism very destruc- 

 tive to the fruit, leaves, and young branches of the walnut and allied 

 species. 



Mosaic Disease of the Tobacco Plant, j — Dr. Ivanowski states that 

 on the diseased parts of the plants the cells of the yellow leaves are 

 filled with thin short rodlets. These are easily demonstrable by proper 

 fixation and staining, and there is no necessity to assume, as Beijerinck 

 did, that the cause of the mosaic disease is a contagium fluidum vivum. 



Bacteriology of Ozaena.J — Dr. F. Perez, who has already described 

 the bacteriological characters of Goccobacillus foetidus Ozsense, § in a 

 second memoir dealing with the aatiology and prophylaxis of the disease, 

 refers the contagion to a canine as well as a human origin. 



Parasitic Theories of Cancer. || — Dr. A. Borrel discusses the 

 numerous views and observations relative to the astiology of cancer. 

 His remarks refer to the coccidian and blastomycetic theories, and are 

 illustrated by numerous excellent coloured drawings. The result of his 

 summing up is that the parasitic theory is not proven. In connection 

 with the illustrations depicting the appearances observed in cancer cells, 

 reference may be made to the drawings illustrating H. O. Juel's paper 

 on tetrad division.^ The appearances herein depicted have certainly 

 superficial resemblance to those seen in cancers. 



Enterococcus of Dysentery.** — X. Lewkowicz believes that he has 

 discovered the cause of dysentery in a microbe whose nearest ally is 

 Pneumococcus. In the stools it is found in pairs or short chains. On 

 Sidid media it occurs singly, in pairs, chains, and tetrads. In fluid media 

 it forms very long chains. It has a well-marked capsule. It is easily 

 stained and also by Gram's method. The growth condition and the 

 appearance of the cultures are much like those of Pneumococcus, but on 

 blood-agar Enterococcus forms large colonies, which in addition are 

 transparent, mucoid, and at times viscid and ropy. It coagulates milk, 

 and is pathogenic to animals. 



* Bot. Gazette, xxxi. (1901) pp. 272-3. 



t Centralbl. Bakt., 2"> Abt., vii. (1901) p. 148. Cf. this Journal, 1900, p. 225 



X Ann. Inst. Pasteur, xv. (1901) pp. 409-16. 



§ Cf. this Journal, 1900, p. 244. 



|| Ann. Inst. Pasteur, xv. (1901) pp. 49-67 (3 pis.). 



«[f Pringsheim's Jahrb. f. wiss. Bot., xxxv. (1900) p. 626 (1 pi. and 8 figs.). Cf. 

 this Journal, ante, p. 299. 



•* Przeglad lekarski, 1901, Nos. 5-7. See Centralbl. Bakt., 2"> Abt., vii (1901) 

 pp. 635-9 (4 figs.). 



