1897J 



MICROSCOPICAL JOURNAL 



131 



on one surface in the same way, or temporarily cement 

 them to the unabraded surface of the g-round g-lass, by a 

 drop of cedar oil or g-lycerine; one thus obtains a series 

 of tones suited to all sorts of objects. — Journal of ^Quekett 

 Microscopical Club. — G. C. Karop. 



Formaldehyde Generator. — This apparatus shown in 

 the illustration has been desig-ned by C. Truax, Green and 

 Co., for the safe, convenient and economic production of 

 formaldehyde by the oxydation of methyl alcohol. 

 D Methyl alcohol is made from wood and is much preferred 

 f^~°""""'^ to sulphur for disinfect- 



I, 1 ing- purposes. It will pen- 



etrate bedding-, furniture 

 and clothing, thoroug-hly 

 ^p^ ] disinfecting them without 



discoloration. 



This lamp is conven- 

 ient, economical and sim- 

 ple in construction, com- 

 pactly made and requires 

 no line manipulation to 

 secure the desired result, 

 A room having- 2,500 

 cubic feet capacity may be 

 thoroug-hly disinfected by 



this g-enerator without any previous preparation by one 



filling of the reservoir. 



Formaldehyde in its g-aseous form has the properties of 

 ready diffusibility and great power of penetration. It may 

 also be used in connection with a sterilizer constructed for 

 the purpose of sterilizing- surgical instruments and dreais- 

 ing-s. — Journal of Am. Med. Association, 



A Polarizing Microscope. — Dr. F. C. Van Dyck of 

 Rutg-er's Colleg-e described in this Journal in May, 1895, 

 a polarizing microscope which he was using- for pro- 

 jection. He has been improving it since that time, till 

 now the results are hig-hly satisfactory- The lantern is a 



