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, conv^enient and economic production of 

 forrhaldehyde by the oxydation of methyl alcohol. 



Methyl alcohol is made from wood and is much preferred 



to sulphur for disinfect- 

 ing- purposes. It will pen- 

 etrate bedding-, furniture 

 and clothing-, thoroughly 

 disinfecting- them without 

 discoloration. 



This lamp is conven- 

 ient, economical and sim- 

 l)le in construction, com- 

 pactly made and requires 

 no fine manipulation to 

 secure the desired result, 

 A room having- 2,500 

 cul)ic feet capacity may be 

 tlioroug-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 g-reat power of penetration. It may 

 also be used in connection with a sterilizer constructed for 

 the purpose of sterilizing- surg-ical instruments and dress- 

 ing's. — Journal of Am. Med. Association. 



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

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

 a polarizini;^ niicrosco])e which he was using- for pro- 

 jection. He has been iinproving- it since that time, till 

 now the results are hiirhlv satisfactorv. The lantern is a 



