1899] MICROSCOPICAL JOURNAL. 3*73 



their appendag-es should be detected and removed. In the 

 case of local tuberculosis where the centers are limited to 

 the internal viscera, and are healed, the meat may be dis- 

 posed of in a raw state to be used as food. 



Texas Cattle Fever. — In a recent number of the New 

 York Medical Journal, Dr. Theobald Smith discusses the 

 Aetiology of Texas Cattle fever with special reference to 

 recent hypothesesconcerning-the transmission of malaria. 

 The paper gives a brief history of the subject from the 

 time that he began his work and reviews the current theo-. 

 ries regarding the transmission of malaria. The summary 

 is, indeed, a most excellent one. Since the aetiology of the 

 American disease has been cleared up the same malady has 

 been found to exist in Finland, Roumania, Italy, Australia, 

 South Africa, and German East Africa, and he thinks it will 

 be found in other similarly situated countries whenever a 

 migration of cattle has taken place, which will tend to min- 

 gle immune and susceptibleianimals. "The recent inves- 

 tigations of Ross, confirmed and materially extended by 

 Koch and his colleagues, showing that in the Proteosoma 

 infection of certain birds the blood parasite completes its 

 cycle of development in one and the same insect by reap- 

 pearing finally in the salivary glands, so that the insect be- 

 comes infectious a certain number of days after drawing 

 infected blood, introduces a most interesting modification 

 of the course pursued by the blood parasite in Texas fever." 



Rusts. — Mr. M. A. Carleton of the Division of Vegeta- 

 ble Physiology and Pathology has recently published the 

 results of his work on the Cereal Rustsof the United States. 

 (Bull. U. S. Dept. of Agr. Div. Veg. Phys. and Path. 16.) 

 This work islargely a physiological investigation,and from 

 his studies Mr. Carleton says : "At least six and proba- 

 bly seven distinct rusts affect the cereals of the United 

 States, as follows : Orange leaf rust of wheat (Puccinia 

 rubigo-veratritici), orange leaf rust of rye (P. rubigo-vera 

 secalis), crown rust of oats (P. coro^ata Corda), black stem 

 rust of wheat and barley (P. graminis tritici Eriks. and 

 Henn.), black stem rust of oats (P. graminis avenae Eriks. 

 and Henn.), and maize rust (P. sorghi Schw.). 



