BY THE SAME AUTHOR 



Pharmaceutical Bacteriology. Second Revised 

 Edition. 97 Illustrations. Octavo, x + 441 

 pages. Cloth, $4.00. 



Bacteriological Methods in Food and Drug Lab- 

 oratories. 93 Illustrations. Octavo. 291 pages. 

 Cloth, $3.00. 



The Microbiology and Microanalysis of Foods. 

 131 Illustrations. Octavo. Cloth, $3.50. 



P. BLAKISTON'S SON & CO. 



PHILADELPHIA 



