II ITER OP TRANSMITTAL. 



U.S. Department of Agriculture, 



Bi im.ai of Animal Industry, 

 Washington, D. C, July 12, 1909. 

 Sir: I have the honor to transmit herewith and to recommend for 

 publication as a bulletin of this Bureau a manuscript entitled "Cul- 

 tural Studies of Species of Pt n ic'iUiu m ," by Dr. Charles Thorn, my- 

 cologist in the cooperative soft-cheese investigations carried on at 

 Storrs, Conn., by tlie Storrs Agricultural Experiment Station and 

 the Dairy Division of this Bureau. A previous paper of this author 

 dealing with certain species of PeniciUium which are characteristic 

 factors in the ripening of Camemhert and Roquefort cheese has been 

 published as Bulletin 82 of this Bureau. The investigations con- 

 nected with the study of the organisms referred to necessitated the 

 culture and com pari -mi of many other species and an examination of 

 the nomenclature for the whole genus P< nicillium. Considerable con- 

 fusion was found to exist regarding the identification of the various 

 specie-, hence it seemed important that a comprehensive study from 



cultural data of all obtainable species should be undertaken. 



Acknowledgment is made of suggestions and advice by Dr. Erwin 

 F. Smith, of the Bureau of Plant Industry of this Department, be- 

 sides the persons whose names are given in the text. 



The illustrations, with one exception, are from original drawings 

 1>\ t he nut hor. 



Respect fully, A. D. Mi:i.\ i\. 



( Tiief of Bureau. 

 I lou. James Wilson, 



Seen tary of Agriculture. 





