AUTHORITATIVE BOOKS 



Milk Secretion 



By John W. Go wen, Biologist, Maine Agricultural Ex- 

 periment Station. A study of the physiology and inheritance 

 of milk yield and butter fat percentage in dairy cattle, look- 

 ing toward the elimination of the poor yield cow before birth. 

 6x9. 30 illustrations. $4.50. 



Hygienic Fundamentals of Food Handling 



By Charles Thom and Albert C. Hunter, of the Micro- 

 biological laboratory, United States Department of Agricul- 

 ture. Treats the principles involved in keeping food free 

 from contamination and pollution, the criteria of fitness for 

 food, principles underlying food preservation, types and 

 evidences of spoilage, etc. 16 illustrations. $3.00. 



Meat and Dairy Hygiene 



Prepared under the direction of the Surgeon General, 

 U. S. A., by Capt. Horace S. Eakins, V.C. A compendium 

 of information; gives results of war experience in the army. 

 6x9. 62 illustrations. 647 pages. Price $6.50. 



Tubercle Bacillus Infection and Tuberculosis in 

 Man and Animals 



By Albert Calmette, Associate Director of the Pasteur 

 Institute. The scientific principles on which the campaign 

 against tuberculosis must be based. Invaluable to the 

 breeder. 714 pages. 6x9. 2d full color plates. Price $8.00. 



THE WILLIAMS & WILKINS COMPANY 



Publishers of Scientific Books and Periodicals 

 BALTIMORE, U. S. A. 



