APPENDIX. 



NOTICES OF BOOKS. 



Alternating Currents and Altcrnat'uig Current MacJiinery. By Dugald 

 C. Jackson and John Price Jackson. Pp. xvii and 729. New 

 York: The Macmillan Co., 1896. 



This is the second volume of a text-book on electromagnetism and 

 the construction of dynamos, and deals, as the title shows, with alter- 

 nating currents and alternating current dynamos and motors. Unlike 

 many books on kindred subjects that have been published it is neither 

 a catalogue of commercial machines with the figures taken from makers 

 lists, nor is it a text-book on pure mathematics with nothing but its 

 title to connect it with actual practice. In the fourth chapter which 

 deals with graphical and analytical methods of solving problems in 

 alternating current circuits the authors have, perhaps, allowed the 

 mathematical part of the subject too much play and have gone into 

 cases which are hardly likely to ever occur in practice. On the whole, 

 however, we strongly recommend the book to the attention of those 

 who, being engaged in practical electricity, are not frightened because 

 on opening a book they see the integration sign. 



The Elements of Physics. By Edward L. Nichols and William S. 

 Franklin. Vol. ii. Electricity and Magnetism, pp. 261. New 

 York: The Macmillan Co., 1896. 



This volume forms the second of a complete course on Physics in- 

 tended as a college text-book. Although there are 227 cuts in the 261 

 pages and the type is large the authors attempt to touch upon most 

 of the points in Electricity and Magnetism. The result is that as a 

 note-book for refreshing the memory the work is excellent, but we 

 sincerely pity the student who attempts to tackle the pages without 

 having previously acquired a fairly extensive knowledge of these subjects. 

 A very serious objection to the book from the student's point of view is 

 that the references are most of them to ^ 000. This careless omission 

 occurs again and again not only when the cross reference is to the third 

 volume, but even when it is to another part of the volume under notice, 

 and also when referring to original papers in Scientific Journals the page 

 is given as 000. 



How to Study Wild Flowers. By the Rev. George Henslow, M.A., 

 F.L.S.,etc. With 57 Illustrations. Religious Tract Society. 1896. 



The writer of this little volume desires to impress on the teachers 

 of Botany in schools the necessity of accuracy on the part of the pupils. 



