204 THE MICROSCOPE. 



when a high power is used, each separate bacillus is distinctly visi- 

 ble. 



Mr. Vignal says Dr. Gibbes' modification of Ehrlich's method 

 has the advantage of requiring only one staining fluid, which can be 

 prepared in advance. A preparation of sputum can be thus quickly 

 and easily made when the detection of the tubercle-bacillus is sought 

 in order to determine diagnosis. 



When the chemicals used in preparing microscopic specimens 

 are not good, the color fades with equal rapidity, whether Gibbes' 

 modification be adopted or not. 



Mr. Vignal says when specimens are mounted in Canada bal- 

 siiro., they are cloudy ; this is especially evident when a high power 

 is used. This inconvenient defect, resulting from light passing 

 through media of different refractive power, is remedied by substi- 

 tuting for Canada balsam the mixture of gum and glycerine which 

 is mentioned above. — The British Medical Journal. 



ADULTERATION. 



One bright and glorious summer's night, 

 When earth, of moon's bewitching light 



A goodly store did borrow. 

 Three house-flies on a window pane. 

 Loud buzzing, planned how they might gain 



A feast upon the morrow. 



"Well, I for one," the first fly said, 



" Shall slake my thirst and dip my head 



Within the milkman's measure." 

 " Far better yet," said number two, 

 "The sugar-bowl Lll wander through 



And feast at my good pleasure." 



"All right, my friends," said number three, 

 " Since now I find we can't agree, 

 I'll light upon the table. 

 And there partake of varied food 

 (As every well-bred house-fly should). 

 As much as I am able. 



