1891.] MICROSCOPICAL JOURNAL. 91 



a good rinsing in a pail of water and place it in the fixing bath. The 

 fixing solution is made by dissolving four ounces of "hyposulphite of 

 soda in a pint of water; let the plate remain in this some minutes after 

 the bromide of silver, which has not been acted upon by the light and 

 vvliich remains yellow, is dissolved out, when it may be removed and 

 washed copiously in running water, dried spontaneously and varnished. 

 This photographic arrangement reduces photo-micrography to the 

 greatest simplicity, and enables any one to delineate sections or mem- 

 braneous tissues. When powers higher than one-fifth of an inch focus 

 are used, it might be desirable to have a more powerful light than that 

 aflbrded by the paraftine and camphor, but, as a rule, that will be found 

 sufficient, especially if the edge of the wick be presented towards the 

 object. A further use to which this apparatus may be put is as a pro- 

 jection microscope. A screen of tracing-paper taking the place of a 

 focusing screen, and of any convenient dimensions, maybe made to re- 

 ceive the image in a darkened room, when several persons may exam- 

 ine it with as great facility as if looking at it through the microscope. 

 With a plane mirror, silvered on its face and fixed at an angle of 45°, 

 the course of the rays as they pass thi'ough the objective are thrown down 

 on a sheet of drawing-paper, and thus the image may be traced and 

 even portraved in its natural colors. 



[7o be contimted.'] 



Medical Microscopy. 



By F. BLANCH ARD, M. D., 



WASHINGTON, D. C. 



Pasteur and Hydrophobia. — Many physicians still look upon Pas- 

 teur with suspicion. Possibly the following facts, recorded by Dr. 

 Tomkins, of Leicester, England, in the London Lancet^ may serve to 

 allay such feeling : 



On the same day, a stray dog bit two children, a man, and a dog. 

 The stray dog was then killed, and its spinal cord removed and taken 

 to Pasteur along with the three bitten patients. The bitten dog died 

 of hydrophobia on the eighteenth day. Rabbits inoculated from the 

 spinal cord of dog No. i died of hydrophobia. The human subjects, 

 two of whom were badly lacerated, still are in perfect health at the end 

 of twelve months. They remained under Pasteur's treatment from four- 

 teen to twenty-five days. 



Rarefied Air and Red Blood Globules. — Some observations made 

 by Viault in the high mountains of Peru tend to the belief that residence 

 in a rarified atmosphere stimulates the blood-making function. After 

 fifteen days spent in the mountains he found that the number of red 

 corpuscles had increased from 5,000.000 to 7,100,000 per cubic milli- 

 metre. — La Trilmnc Mcd.^ Dec. 2j, j8qo. 



The Characteristic Organism of Cancer. — Dr. W. Russell, in the 

 Provincial Medical Journal for January i, 1891, gives the results of 

 his prolonged microscopical study of cancer. In the affected tissues he 

 has invariably found certain organisms which he provisionally calls 

 '• fuchsin bodies," because they were originally discovered by using a 

 double stain of aniline green and fuchsin. In size they vary from half 



