Chemutry and Physics 



4. .1 Lahrratory '. 

 turn to (^nalltatlm ^ 



Instruction given in the Laborafories of the Royal Colloffe of 

 Chemistry. With 90 engravings. By W>r. G. Valentin, F.C.S 

 MO, pp. xii, 380. London, 1871. (John Churchill k Sons/. On, 

 of the chief difficulties, which beset the chemical instnictor :it the 

 ]irtsfnt day, is that of satisfactorily combining didnctic wiih 

 practical instruction ; of teaching by text-book recitation on tie 

 one hand, and at the same time, of instructing by laboratory 

 experimentation on the other. While it is unquestionablV 

 true that Chemistry cannot be properly learned solely bv coiii- 

 mitting a volume to memory, it is equally true that' it cannot 

 be mastered by working solely with apparatus, lioth the in- 

 tellectual and the manual discipline are necessary. In the book 

 uthor, fully recognizing these two phages o1" tic 



■^cmlinervH^m'on 



to be proved by experiment ; 



I individual and alone Nor on the other hand, 

 ;o be memorized and recited from, parrot-like, 

 author's endeavour," he says in his preface, " to c 

 o theoretical considerations as was absolutely i 



II the laws which govern chemical changes, and 



';r, 



) parts. Part First consists of " 



' Analysis proper. In the first part, i 



Qualitative Chemical Analvsis." Part, Second is a course of Quali- 

 ident begins by 

 'nts with hydro- 

 gen and continues with oxygen, sulphur, chlorine, etc., and their 

 compounds, the theoi-etical knowledge being gradually worked 

 m as It is required. In the second part the usual division of the 

 bases and acids into groups is followed, the whole being well 

 arranged. Frankland's notation, wherein every chemical com- 

 nd is formulated upon the type of the highest equivalence of 



througho; 



'ts domin . ^ 



combining powerVe7er7mole7ure7.o ^.. •>., ->--- 



taced type, thus, NO^ Ago, SO^Zno", B^aOg, etc. Graphic for- 

 mulas are also freely employed. At the end of each chapter in 

 both parts, are questions for examination, which are remarkably 

 Jll and thorough. The reactions in all cases are given, and all 

 \ tacts which help the student to a complete knowledge of the 

 substance under examination are fully stated. Frequent examina- 

 tions are recommended, and these are to be conducted like recita- 

 lons. Copious tables in the appendix contain a condensed state- 

 o/?i ^^^ analytical processes, of the solubilities of salts, and 

 W ?^^*"^ system of weights and measiires. 

 >v e hg,pg rarely seen a better book to teach from than this. In 

 1^8 plan and the mode of carrying it out, its clearness, thorough- 

 ;^' ^f'curacy and attention to detail, it is, in our view, one of the 



