Chemistry and Physics. 395 



less purely descriptive than formerly. It seems certain that this 

 book will be extensively used, particularly by teachers and by stu- 

 dents who have had some preliminary training, and it is to be 

 hoped that an English translation will soon appear. h. l. w. 



6. The Elements of Inorganic Chemistry for Use in Schools 

 and Colleges ; by W. A. Shenstone, 12mo, pp. xii, 506. London, 

 1900 (Edward Arnold). — The aim of this book is to provide a 

 graduated course which may be used at a period during which 

 pupils pass from childhood to adolescence. It begins with a 

 course of experimental work for quite young students and devel- 

 ops into a text-book for those who are older. A striking feature 

 of the work is the large number of experiments devised to enable 

 the student to verify quantitative laws and relations. These 

 experiments are well chosen and very clearly explained, and they 

 will doubtless furnish many useful suggestions to teachers of 

 chemistry. The sections on carbon include much that is usually 

 omitted from books on inorganic chemistry. The periodic system 

 is made the basis of classification after the non-metallic elements 

 have been separated from the metallic. Electrolytic dissociation 

 and ionization are only briefly discussed. h. l. w. 



7. Die Kohlenoxydvergiftung, von W. Sachs. 8vo, pp. x, 

 236, Braunschweig, 1900 (Friedrich Vieweg und Sohn). — This 

 monograph on poisoning by carbon monoxide treats the subject 

 very lully in its clinical, hygienic and medico-legal aspects. An 

 elaborate index of the literature is included in the work. 



h. l. w. 



8. The Hall Effect in Flames. — The theory of the wandering 

 of ions in metals gives renewed interest to the phenomenon dis- 

 covered by Professor Hall and known by his name. E. Marx 

 discusses analytically the point whether the different velocities of 

 the positive and negative ions in a magnetic field can account for 

 the Hall effect, and reaches a value for the rotation coefficient. 

 He concludes that the only possible way of reaching quantitative 

 results in regard to the Hall effect is in the direction ot flame 

 conduction in a magnetic field. Arrhenius believes that the 

 conveyance of electricity in flames is accomplished through 

 electrolytically dissociated ions. The velocity of the ions with 

 a fall of potential of unity is 10 6 times greater than in the case 

 of electrolytes and very different in the cases of the positive 

 and negative ions. So that we are led to expect a Hall effect a 

 million times greater than in the case of electrolytes. A full 

 account of the author's apparatus and his experiments is given 

 and he reaches the conclusion that the Hall effect in flame gases 

 has the dimensions which would be expected on the hypothesis of 

 of wandering electrical ions in a magnetic field. The author's 

 experiments, however, do not decide the question whether the 

 Hall effect in metals can be explained by pondero-motive effects 

 on wandering ions. — Ann. der JPhysik, No.8, pp. 798-834, 1900. 



J. T. 



