432 MICROBIOLOGY 



This he also referred to as Coccidium avium. Cole and Had- 

 ley 3 have ascribed the disease of turkeys known as blackhead 

 to an invasion by a coccidium. Hadley 4 describes the mor- 

 phology of this coccidium, accepting the generic term Eimeria, 

 describing it under Eimeria avium. Later, Cole and Hadley 5 

 described their findings that coccidia are the cause of the dis- 

 ease known as blackhead in turkeys.* 



Raillet and Lucet 6 described a "renal coccidiosis" in 

 geese caused by a coccidium designated Coccidium truncation. 



Smith 7 reported finding cysts of sporozoa in the intestine 

 of cattle but he did not identify them. They appeared as 

 homogeneous and knobbed crescents within the cysts. 



3 Cole and Hadley. Science, N. S. Vol. XXVII (1908) p. 994. 



4 Hadley. Archiv. f. Protistenkunde, Bd. XXIII (1911). 



3 Cole and Hadley. Bulletin 141, Agric. Exp. Station of the Rhode 

 Island State College, 1910. 



* The disease known as blackhead was described by Theobald 

 Smith (see p. 381) as being due to Amoeba melegridis. In Science 

 for Oct. 14, 1910, Smith replies to some of the publications of Cole 

 and Hadley in which he points out that after a careful review of the 

 slides which he had prepared in his original study of blackhead he 

 finds no evidence that the disease is due to coccidia. 



6 Raillet and Lucet. Compt. rendu de la Soc. de Biol., Vol. XLII 

 (1890) p. 293. 



7 Smith. Bulletin No. 3, B. A. I., U. S. Dept. Agric., 1893, p. 73. 



