128 THE AMERICAN MONTHLY. [May. 



Prof. Tingley described how artificial snow crystals could be 

 formed ; put a few drops of strong aqua ammonia near the mid- 

 dle of the slide ; right adjacent to the ammonia put a few drops 

 of spirits of camphor. The vapoi-s from each unite, produce in- 

 tense cold, and crystals are formed under the objective (a 2-inch 

 is to be preferred) . 



New Jersey State Microscopicai, Society. 

 January 2jtk. — The President, Rev. Samuel Lockwood, read 

 a paper on the " Blood of Kemmler," and exhibited slides. This 

 being the 2ist year of existence of this Society, a committee was 

 appointed to arrange for a celebration of the event. 



New York Microscopical Society. 

 April 22d. — The 13th Annual Exhibition was held at the 

 American Museum of Natural History. Nearly one hundi-ed in- 

 struments were in use and various microtomes, illuminators, 

 photomicrographic apparatus, etc. Lantern slides were projected 

 in an adjoining room by three difterent exhibitors, each occupy- 

 ing 30 minutes. 



NEW PUBLICATIONS. 



Revie-u of Artesian Horizons in Sojitherii Nexv Jersey. By 

 Lewis Woolman. 



This is a paper of i 3 pages from the Report of the New Jersey 

 State Geologist for 1S81, showing their persistence and extension 

 southward beneath the Atlantic Coastal plain and their relative 

 positions within and beneath a 300-foot diatomaceous clay bed. 



This bed extends also into Delaware. At Malcom's Mill the 

 diatoms are very abundant and readily seen by transmitted light. 

 At Emerson's Mills they are coated with iron pyrites, but may 

 be seen with reflected light. At Herring Bay is found a bed 

 characterized by heliopelta. 



The paper is accompanied with a plate of some 50 diatoms 

 from an artesian well-boring at Beach Haven, N. J. The forms 

 were mounted by Dr. D. B. Ward. 



General Bargain List. Williams, Brown & Earle, Tenth and 

 Chestnut Streets, Philadelphia, Pa. 



This is a list of all sorts of microscopical material at reduced 

 prices. Those needing goods should send a postal card request- 

 ing a copy. 



Catalogue of Willi ains & Norgate's Publications. January, 

 1893. London. 



These are the well-known publishers of the Journal of Royal 

 Microscopical Society and of Qiiecket Club. We notice also 

 many of Herbert Spencer's works in the list. There are five of 

 Cooke's works, including the British Algje and British Desmids. 

 The catalogue is sent to applicants who enclose return postage. 



