28 THE AMERICAN MONTHLY [Feb 



ings are all in type and we hope they will be published by 

 February. 



Moulds. — Dr. Smith Ely Jelliffe of Brooklyn has been 

 carrying" on some excellent investigfations. We presented 

 an article last month which we abbreviated from the "Drugf- 

 g"ists Circular", one of our best exchang-es and in which 

 there is often something- of interest to microscopists. 



Periodical Sale. — With only one insertion of the "M. J." 

 advertisement, the owner has sold to one of our esteemed 

 contributors the 46 bound volumes of the Monthly Micro- 

 scopical Journal and the Royal Microscopical Society 

 Journal for $46, cash on delivery. It is a barg-ain and an- 

 t)ther such opportunity may not occur in many months. 



Catalogue. — Send 2-cent postal card to Dulau & Co., 37 

 Soho Square, London, for 30-pag-e catalog-ue of books and 

 papers relating- to microscopy and for sale by them at net 

 'prices named in this pamphlet. Some of the prices are 

 very hig-h but they have a really wonderful collection of 

 microscopical publications. 



Objects. — Suter, 10 Hig-hweek road, Tottenham, Lon- 

 don, sends free a catalog-ue of 50,000 choice objects. He 

 buys collections and sells cabinets. 



Most Powerful Objective. — The best yet made is the 

 1-10 inch mono-bromide of napthaline immersion lens, 

 numerical aperture of 1,60 made by Zeiss. Its work is lim- 

 ited to resolving- a detail more than 1-8000 of a millimeter 

 (.000,005 of an inch) in width. 



Leprosy. — The International Cong-ress on Leprosy has 

 declared that this disease is due to a bacillus discovered by 

 Hansen in 1871, that no other animal than man suifers 

 from it, that it is contagious but not hereditary, and that 

 isolation is desirable. 



Vaccination. — Small granular ameboid bodies are found 

 in the blood of vaccinated ehildren. Similar amoeba have 

 been found in blood of vaccinated monkeys. They have 

 a diameter of one-third that of a red blood-cell. 



