474 SUMMARY OF CURRENT RESEARCHES RELATING TO 



means of the cattle tick (Ixodes bovis) in cases of Texas fever, tick fever, 

 and hemoglobinuria. In the bovine malaria of the Eoman Campagna 

 and of Turkey, there is no record of ticks associated with the disease. 

 The paper forms a useful summary of the facts at present known. 



Gregarines and flntestinal Epithelium. * — MM. L. Leger and 

 O. Duboscq have studied the life-history of Pyxinia mbbuszi which occurs 

 abundantly in the intestine of the larva of Anthrenus muscorum, as well as 

 of various other Gregarines, with special reference to the reputed occur- 

 rence of a true intracellular stage in Gregarines in general. They find 

 that in Pyxinia the sporozoites escape from the sporocyst, are at first 

 thread-like, but later become pyriform, and develop a small mobile 

 appendix at their anterior extremity. By this appendix they attach 

 themselves to the intestinal cells, but it is the appendix only which 

 penetrates the cell. Mobusz, in studying Gregarines, was deceived by 

 the resemblance between the parasites and certain secretory appearances 

 in the intestinal cells, and believed that the former penetrated the cell 

 completely. The authors have never found Pyxinia completely within 

 a cell, and believe that the phenomenon is at most very exceptional 

 among Gregarines, which are generally attached by the cap only. 



Serum Reaction of Proteus vulgaris.f — Dr. A. Eodella finds that 

 Proteus vulgaris is agglutinated by the blood of guinea-pigs which have 

 been injected with virulent or dead cultures or with nitrates, and which 

 have been repeatedly fed with Proteus cultures. Clumping was also 

 observed in the blood of new-born guinea-pigs whose mothers had been 

 infected 20-40 days before pigging with virulent cultures, and the milk 

 of such guinea-pigs was likewise agglutinating. Chain-formation was 

 also a marked feature of the reaction, but this did not occur with every 

 Proteus-race. The agglutination is regarded by the author as a specific 

 reaction, and he expresses his belief that the microbes included in the 

 designation P. vulgaris are varieties of several species rather than one. 



'J* Comptes Rendus, cxxx. (1900) pp. 1566-8. 

 t Centralbl. Bakt. u. Par., 1"> Abt., xxvii. (1900) pp. 583-91 (3 figs.). 



