BACTERIA, YEASTS, AND MOLDS 

 IN THE HOME 



BY 



H. W. CONN, PH.D. 



PROFESSOR OF BIOLOGY IN WESLEYAN UNIVERSITY, MIDDLETOWN, CONN. 



ATITHOR OF "AGRICULTURAL BACTERIOLOGY," " BACTERIA IN 



MILK AND ITS PRODUCTS," "THE STORY OF GERM 



LIFE," "THE METHOD OF EVOLUTION," ETC. 



GINN & COMPANY 



BOSTON NEW YORK CHICAGO LONDON 



