1894 THE MICROSCOPE. 139 



kind for which they are recommended, as a great portion 

 of every-day work, especially of a physician, does not 

 require the maximum of optical performance, and can be 

 as well accomplished, and with less skill of manipulation 

 with glasses of comparatively low aperture. 



Such an outfit can be purchased for a sum ranging from 

 $40 to $60, so that the excuse of too great an expense at 

 the start is no longer a good one. But the price alone 

 must not induce one to purchase without any refer- 

 ence to quality. In contemplating the purchase of an in- 

 strument we should always be cautious of objectives re- 

 commended for their cheapness alone; especially so of ob- 

 jectives not bearing the name of a maker as it is fair to 

 assume that if a maker does not attach his name he knows 

 of their doubtful quality. The inexperienced should al- 

 ways in purchasing, reserve the right of having them ex- 

 amined by an expert. It will require but a short time, in 

 comparing inferior instruments with one of reliable work 

 to discover the inferior quality of the optical parts, and 

 will then not only prove a source of disappointment, but a 

 pecuniary loss as well as it will necessitate a future out- 

 lay for reliable work, or may lead to discouragementand 

 abandonment of a fascinating and practically useful 

 study. — Toledo Medical Gompend. 



THE THERAPEUTICS OF GLYCOZONE, COMPOSITION 



AND CHARACTERISTICS. 



By Cyrus Edson, M. D. 



Health Commissioner, Board of Health, New York City. 



Glycozone is defined by its discoverer, Mr. Ch. Marchand, to 

 be a stable compound, resultin*;; from the chemical reaction 

 that takes place when c. p. glycerine is submitted, under cer- 

 tain conditions, to the action of fifteen times its own volume of 

 ozone, under normal atmospheric pressure at a temperature of 

 0°C. 



