188 EEViEWS. 



Fredericella Sultana. — This is one of the fresh-water Polyzoa. 

 Some of the tentacles are extended. This was effected by placing 

 a portion of the Polyzoa in a deep vessel containing a little 

 water ; then, seeing that the tentacles were extended, I suddenly 

 added boiling water, which appeared to produce instant death. 

 If instead of merely mounting the houses^ as is usually the case, 

 we could have the inmates peeping out of the windows, collections 

 of marine and fresh-water Polyzoa would be much more interest- 

 ing. The boiling-water plan appears to me likely to prove effect- 

 ual, but if any friends have had better success with alcohol or 

 osmic acid, the information would be welcomed by many. 



Isaac C. Thompson. 



Practical Introduction to Chemistry. By W. A. Shen- 



stone, Lecturer on Chemistry in Clifton College. Crown 8vo, pp. xiv. — 109. 

 (London: Rivingtons. 1886.) Price 2s. 



This little book is intended to give pupils a sound knowledge of some of 

 the chief elementary facts of chemistry. This, the author very properly 

 insists, can only be done by habituating them to experiment, to observe, and 

 write out clear accounts of the results of each experiment for themselves. He 

 also advocates the early use of the balance and other instruments of precision, 

 in order to obtain quantitative results. This must prove a handy little work 

 for young pupils who are taught to use their own hands in chemical work. 



The Chemist's Pocket Book ; for Chemical Manufacturers, 



Metallurgists, Dyers, Distillers, Brewers, Sugar Refiners, Photographers, 

 Students, etc. By Thomas Bayley, Assoc. R.C.Sc.L Fourth edition. 

 (London : E. & F. N. Spon, 125, Strand.) Price 5s. 



This small Pocket Book will save every practical chemist who uses it a 

 vast amount of time in searching various publications for special tables and the 

 technical information he requires. It is nicely got up, and the type, though 

 necessarily small, is clear, It should meet with a large sale, as it appears to 

 supply a distinct want. 



A Manual of Chemistry. By A. Dupre, Ph.D., F.R.S., 



etc. etc., and H. Wilson Hake, Ph.D., F.C.S., etc.; with a coloured table of 

 Spectrae. (London : C. Griffin and Co. 1886.) Price 7s. 6d. 



This is a well written and nicely-arranged text-book, which will be found 

 useful to chemical students of all classes. Amongst its more prominent 

 features are the physiological actions of the substances on which it treats, and 

 the very useful footnotes giving the origin of many of the technical terms used. 

 We are pleased to be able to recommend it heartily. 



Qualitative Chemical Analysis, Inorganic and Organic. 

 Part I. — Elementary Stage. For Schools and Science Classes. By J. Patchett, 

 F.C.S., 1st B.Sc. (Lond.). Crown 8vo, pp.44. (Leeds: Bean and Son ; 

 London : Simpkin, Marshall, and Co.) Price is. 



