ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 595 



and Sachs, according to which the sensibilisatrice (amboceptor) furnished 

 by the ox-serum only unites with the blood-cell when first combined to 

 the alexine (complement) provided by the fresh horse-serum, the authors 

 consider as inexact ; for the preponderating amboceptor belongs to the 

 horse-serum and not to the ox-serum ; and the amboceptors do not 

 require the presence of an alexine to enable them to unite with the blood- 

 cells. The authors consider that Ehrlich's interpretation neglects an 

 essential factor, viz. the intervention of a special substance of a colloid 

 and albuminoid nature peculiar to ox-serum, resisting heating to 5G° C, 

 and having the power to be attracted by the cells charged with ambo- 

 ceptor and complement, although remaining free in the presence of 

 normal cells or of those holding only amboceptors. The absorption of 

 this substance by the cells causes energetic agglutination, and renders 

 them more readily hgeruolysed. The absorption is probably due to 

 molecular adhesion, the adhesive properties of the cells being modified 

 by their previous treatment. 



Bacillus phytophthorus.* — G. Delacroix finds that the black stem- 

 rot of potatoes, a disease occurring in spring, is due to B. phytophthorus, 

 a short bacillus, almost a coccus, which rapidly liquefies gelatin. Like 

 B. solanincola, it is invariably found associated with the mycelium of 

 Fusarium. 



Granulation of Vibrios.f — CI. Q. Ruata investigated the cause of the 

 granulation which occurs in old cultures of vibrios (choleric and choleri- 

 form), and selected for experiment V. Metchnikowi. His general 

 results amounted to this, viz. that all substances which render the medium 

 unfavourable for their vegetation and enfeeble their growth, cause the 

 production of the granulation ; among the causes cited are alkalis, acids, 

 ether, chloroform. 



Calmette, A., & C. Guerin — Origine intestinale de la tuberculose pulmonaire 

 et mecanisme de 1'infection tuberculeuse. 



[In this, the third contribution, the authors advance further experimental 

 proof that tuberculosis of the lungs is of intestinal origin.] 



Ann. Inst. Pasteur, xx. (1906) pp. 609-24. 



* Comptes Rendus, cxliii.'(1906) pp. 383-4. 

 t Ann. Inst. Pasteur, xix. (1905) pp. 661-72. 



