1898.] MICROSCOPICAL JOURNAL. 65 



in case of premiums involving- $25,000 they may well em- 

 ploy the best experts. The urinary examination should 

 never be omitted, and each larg-c city can now support one 

 or more microscopists who do this work. In St. Louis, 

 the Paul Paquin laboratories are working- up a larg-e prac- 

 tice by advertising- and by skillful work. 



Opaque Objects. — Prof. Gates has discovered how to 

 view, with a microscope of high power, the upper surface 

 of an opaque object, by means of reflected lig-ht, in such a 

 manner as to g-et details never before obtained by super- 

 stage illumination. He finds by using- rays of the short- 

 est possible wave-leng-th that he can focus down into an 

 opaque object upon details beneath the surface. This is 

 especially applicable to org-anic tissue. It is a discovery of 

 the very g-reatest possible interest to patholog-y and biol- 

 ogy in general. With lenses out of other substances than 

 glass, he feels sure that he might be able to focus the ultra- 

 violet microscope upon a living cell in the living cortex and 

 take a photomicrograph of such a cell throug-h scalp, skull, 

 pia and dura, and neuroglia. He has been able already to 

 focus upon a capillary beneath the sub-cutaneous tissues 

 of the fing-er. 



Angina. — Micrococcus tetragenus has been proven in 

 cases of ang-ina. There were usually manifestations of 

 disease in the pleura preceding the angina. The cultures 

 show it alone or associated with different microbes. 



Mosquitoes. — Malarial disease is carried by these ig-ents 

 rather than by winds. It is well-known that people in 

 houses protected by mosquito netting rarely g-et malaria. 



Agar-agar Jelly. — Gallois uses it in skin diseases on ac- 

 count of cleanliness in lieu of lard or vaseline. For ery- 

 sipelas take 1.5 grain corrosive sublimate, same of tartaric 

 acid, 15 grains of agar-ag-ar, and 3 ounces of water. 



