216 THE AMBRICAlSr MONTHLY [July 



In asking another publisher what he would do, we were ad- 

 vised to say anything the author desired, since it would bring 

 positive advantage to us, and since telling the truth about the 

 book would not secure us any appreciative support from our 

 subscribers commensurate with the cost. 



Subscribers and readers! What do you say? Do you ap- 

 prove the English or the American style and what will you do 

 about it? 



Authors and advertisers ! Will you withhold advertising as a 

 punishment for our telling the honest truth, as we see it, about 

 your books ? We want a lot of answers to these questions by 

 first mail. 



MICROSCOPICAL APPARATUS. 



Instantaneous Photomicrographs. — Apparatus has been 

 prepared by Chas. Baker, London, for making instantaneous 

 photomicrographs and viewing the image until exposure is 

 made. The apparatus consists of a case containing a metal 

 shutter, carrying a j^rism, and connected with a pneumatic re- 

 lease. When this shutter is set, the image in the microscope is 

 projected, by means of a prism, onto a screen, which is fixed in 

 an adjustable tube at right angles to the optic axis, and can be 

 viewed and focussed up to the moment of exposure. To insure 

 accurate focus, the screen in the adjusting tube should be placed 

 the same distance from the microscope as the plane of the sen- 

 sitised plate. A slit in the shutter can be opened and closed to 

 regulate the exposure. 



A Clinical Device. — Dr. Eugene Shurtleff', of Boston, has 

 simplified the clinical microscope so that everyone who has a 

 draw tube with a society screw can have one. A sheet of brass 

 three-fourth inches long and one-sixteenth thick is wide enough 

 to nearly embrace the draw tube when bent. At the distal end 

 of the sheet, two clips are cut out and beat so as to hold the 

 slide. The coarse adjustment is easy; the fine adjustment is 

 not so easy. Still, when once in focus, it is easy to keep it so. 

 In quantities they can be furnished at twenty-five to fifty cents 

 each. 



An Improved Cell of Glass and Celluloid for the 

 Preservation and Exhibition of Microscopic Eye-Spec, 



