1896 THE MICROSCOPE. 57 



THE MiCROSCOPE. 



New Series, 1893. 



Fot- Naturalists, Physicians, and Druggists, and Designed to Popularize 



Microscopy. 



Published monthly. Price $1.00 per a7tnum. Subscriptions should end 

 vjith the year. The old series, C07isisting of 12 volumes {iSSi-/8gj), endid 

 with December, iSgi Sets of the old series can?iot be furbished. All 

 correspondence, exchanges, a7;d books for notice should be addressed to the 

 Microscopical Publishing Co., Washington, D. C, U. S. A. 



CHARLES W. SMILEY, A. M., EDITOR. 



EDITORIAL. 



Preservation of Yeasts. — Hanson carries out this in using 

 10 per cent solutions of sugar-cane. Stock yeasts may be kept 

 for many years without suffering any detriment. They can be 

 propagated in beer wort and transported at pleasure. Hanson 

 and others have sent yeasts from Copenhagen to South America, 

 Australia and Asia in perfect condition. Those interested should 

 get from London the English translation of Hanson's " Prac- 

 tical Studies in Fermentation ; being contributions to the Life- 

 history of Micro-organisms." 



Sodium Fluoride as an Antiseptic. — Sodium fluoride, 

 flurul, isaaidto be a valuable anti.septic, and it is a bluish-white 

 odorless powder of saline taote. It is said to be preferable to 

 corrosive sublimate, which is sixteen times more poisonous, and 

 preferable to nitrate of silver, formaline and perujangauate 

 In 1 per cent or even in half per cent solutions it acts as a pow- 

 erful germicide. One of the objections to the use of corrosive 

 sublimate is that the albumenoids are coagulated and Inicteria 

 are protected by an envelope of coagulated albumen. This is 

 not the case with sodium fluoride. 



