142 THE MICROSCOPE. Sept. 



Brain in Soft-Shell Turtles," by Susanna Phelps Gag^e, of 

 Ithaca, N. Y.; "The Rotifera in Sandusky Bay, by Prof. 

 E. W. Claypole, of Akron, and D. S. Kellicott, of Colum- 

 bus, O.; "On the Public Water Supply for Small Towns," 

 by Dr. M. A. Veeder, of Lyons, N. Y.; "The Requisites 

 of a Pure Water Supply," by Dr. William C. Krauss, of 

 Buffalo, N. Y. ' 



PRACTICAL SUGGESTIONS. 



BY h. A. WILSON, 

 CLEVELAND, OHIO. 



The Detection of Adulterations in Food. — A micro- 

 scopist may accomplish a large amount of useful and prac- 

 tical work by examining and demonstrating adulterations 

 in foods, drugs and commercial articles. 



A substance will exhibit under the microscope particu- 

 lar appearances. A stranger introduced will at once be 

 recognized. That one may know that a stranger is a 

 foreigner, the first requisite is to know exactly the appear- 

 ance of the pure article. To obtain this knowledge requires 

 time, patience and perseverance. Having become familiar 

 with the pure article it is very easy to detect the adultera- 

 tions. It is practically impossible to deceive the micro- 

 scope when its revelations are interpreted by an expert 

 eye. 



Keep the Eye Pieces Clean. — Once upon a time a dealer 

 with a large invoice of nice bright golden microscopes de- 

 scended upon a town. 



He found an interested prospective purchaser. To ex- 

 hibit a lens he placed a drop of his blood upon a slide, fo- 

 cussed and looked down the tube, when horror to relate he 

 beheld every corpuscle teeming with bacteria. Cold pers- 

 piration streamed down his brows and cold chills coursed 

 up and down his anatomy; when a veteran microscop- 

 ist present took a look, turned the eye piece and dis- 

 covered that the alleged bacteria were minute spots of 

 dust upon the lower lens of the eye piece. This is a fre- 



