SCIENCE- GOSSIP. 



such a spur as it had never hitherto. The interest 

 attached thereto has waned but little, and the 

 work now forms a stable industry in the work- 

 shops of the instrument maker and the practical 

 electrician. The author of the present work has 

 spared no pains in bringing forward the fullest 



described of arriving at the same result, the defects 

 or advantages of each being pointed out. The 

 important question of the interruptor or break 

 receives the attention it deserves, three chapters 

 being given over to that subject. The volume 

 finishes with two useful appendices of theoretical 



Primitive Mammals I Beaked Animals I 

 (rromgmm all a| 1 ' ' 



Genealogical Tree, from Haeckel's "Evolution of Han." 



(From " Problems of Evolution," by F. W. Headley. ) 



details of construction for the benefit of his readers. 

 Every practical point is considered, from the com- 

 mencement to the finish of the coil, and the book 

 is well illustrated with numerous dimensional 

 drawings. In many cases two methods are 



considerations. It is to be regretted that the book 

 did not appear three years ago, when coil-making 

 excitement was at its height. Nevertheless it 

 should form a standard reference book for the 

 purpose in view. — J. Q. 



