1871J Notices of Books. 385 



with special reference to junior classes in which elementary 

 chemistry is taught. In order to give our readers some idea of 

 the contents and manner of treatment, we quote the headings of 

 the sections of this little work : — Chemical Calculations ; French 

 System of Weights and Measures ; Conversion of Thermo- 

 metric Scales ; Correction of the Volume of Gases for Tempe- 

 rature and Pressure ; Specific Gravity of Solids, Liquids, and 

 Gases ; To Calculate the Percentage Composition of a Compound 

 from its Formula ; To Calculate the Amount of Material 

 required to Produce a Given Weight of any Substance : or the 

 Quantity of the Substance produced by the Decomposition of a 

 known weight of the Material ; Combination and Decomposition 

 of Gaseous Bodies ; Calculation of the Results of Atomic 

 Weight Determinations ; Deduction of the Empirical Formula 

 of a Body from its Percentage Composition ; Calculation of the 

 Formula of a Body from the Results of its Analysis ; General 

 Analytical Questions ; Exercises on the Specific Heat, Latent 

 Heat, Calorific Power, and Calorific Intensity of Substances. The 

 Appendix contains in tabulated forms : — (1.) Combining weights 

 and symbols of the elements ; (2.) Weight of 1 c.c. of atmo- 

 spheric air at different temperatures, from o° to 300 , at 

 760 m.m. pressure ; the weight of 1000 c.c. of water of 

 t° C, when determined by means of brass weights in air of 

 o°C, and of a tension 0760 m.m., is equal to 1000—* grms.; 

 volume and density of water at different temperatures (Kopp); 

 for the conversion of the degrees (T') of a mercurial thermometer 

 into the corresponding values (T") of an air thermometer; portions 

 of tables of logarithms and antilogarithms. We sincerely wish 

 that this excellent book, which is to be shortly followed by a 

 key to the questions contained therein, will prove an assistance 

 to teachers as well as pupils, and become a great impulse to a 

 more general learning of a science which is, on account of its 

 utility, of the greatest national importance to the whole com- 

 munity. 



The Sub-tropical Garden, or Beauty of Form in the Flower 

 Garden. By W. Robinson, F.L.S.; with Illustrations. 

 London : J. Murray, 1871. 



The term " sub-tropical " is scarcely a happy expression, and if 

 this work had reference only to plants which required a sub- 

 tropical climate to bring out their beauties, it would be of little 

 use. except to the very wealthy. This term is, however, here 

 used in a wider sense, and it means the culture of plants 

 with large and graceful or remarkable foliage or habit, and the 

 association of them with the usually low-growing and brilliant 

 flowering plants now so common in our gardens, and which 



