240 THE AMERICAN MONTHLY [Aug. 



DETECTION OF CRIME. 



One night, an assassin killed a drover in Ohio, and secured a 

 package containing S1800. In getting away he hurt his hand 

 and stained the package with blood, after which he threw away 

 the wrapper. Suspicion having rested upon a certain man who 

 was found to be spending money freely, the police followed him 

 and examined every bank note that he parted with, until one 

 was found containing a smear of blood. Examined under a 

 magnifying glass, the streaks of blood on the wrapper were 

 found to correspond exactly with those upon the bank note. 

 It was then proven that the wrapper had been in possession of 

 the murdered man. Upon this evidence the prisoner was con- 

 victed and hanged. 



THE MICKOSCOPE. 



Contents for August, 1S93. 



Extract fioui the President's Address Before the Manchester Microscop- 

 ical Society, by J. F. Goode 113 



DemonstratiDg Cyclosis, by K. N. Reynolds, M. D 116 



The Primary Food Supply is Microscopic, by Prof. W. K. Brooks 117 



List of Microscopical Societies, by Chas W. Smiley. (Illustrated) 119 



To Open a Rusty Knife. (Illustrated) 122 



Editorial. — Meetings of the American Society of Microscopists .. 123 



Questions Answered. — Nos. 164-1()7, by Dr. S. G. Shanks 124 



164. Hoyer's Picro-Carmine 124 



165. Where to buy Aniline Dyes 124 



166. Numerical Apperture 124 



167. To Tell the Thickness of Cover- Glasses 125 



Practical Suggestions. — by L. A. Willson 125 



How to Produce Pretty Crystals of Borax 125 



A Method of Mounting Peri thecia of Erysiphe 126 



Flower Crystals of Sugar 126 



Demodex Foliculorum 126 



Correspondence. — Diatoms, by E. H. G 127 



Recent Publications. — Introduction to the Study of the Diatomoea? 



by F. W. Mills 217 



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