432 Scientific Intelligence. 



Philosophy by J. D. Quackexbos (literary editor), A. M. Mater, 

 F. E. Nipher, S. W. Holmax, F. B. Crocker. 544 pp. New 

 York, Cincinnati, Chicago, (Amer. Book Co. — D. Appleton Co.'s 

 Press). It is satisfactory to receive an elementary work on 

 Physics which, like the one in hand, is fresh and new throughout, 

 and not an abridged reproduction of matter and illustrations 

 which have done duty for many years. The limitations of a 

 book for early students in a subject so large and profound are 

 severe, and it would not be difficult here to find points to criticize, 

 but the manner in which the several editors have done their 

 work is deserving of decided commendation. The simplicity of 

 the treatment and the practical character of the illustrations 

 make the book particularly well suited for the class of students 

 for which it is written ; it should have a wide sphere of useful- 

 ness. 



14. Handwbrterbuch cler Chemiker. By Dr. Carl Schaedler. 

 12mo, pp. vi, 162. Berlin, 1891 (Friedlander). — A series of brief 

 biographical sketches of eminent chemists and physicists. The 

 Americans noticed are the two Sillimans and Remsen. 



15. Bibliotheca Polytechnica : a Directory of Technical Litera- 

 ture. By Y. Szczepaxsli. 12mo, pp. 80. New York, 1890. 

 (Int. News Co.). — A classified catalogue of technical books and 

 periodicals published in America and Europe. 



II. Geology axd Xatueal Histoey. 



1. On the Rock-fracture at the Combined Locks Mill, Apple- 

 ton, 'Wisconsin; by Feaxk Cramer. (Communicated.) — It was 

 impossible, after the upheaval of a part of the pulp-mill at the 

 Combined Locks, in September, 1889,* to get direct evidence of 

 movement in the underlying rock. During the past summer, the 

 water was pumped out of the tail-race for the purpose of deepen- 

 ing the latter, and this gave an opportunity to examine the rock 

 layer on which the mill rests. It will perhaps be well to describe 

 the fracture in the rock under the mill, to show how accurately 

 the cause was registered in the effects. 



What the extent of the disturbance was just outside of the 

 cement pier and above the dam, cannot be known. But inside, 

 under the mill, the crack in the rock begins directly under the 

 big crack in the pier and runs under the piers supporting the 

 sixth, seventh and eighth machines and close to those supporting 

 the third, fourth, fifth, ninth and tenth machines. It passes out 

 under the sixth and seventh windows and ends in the quarry in 

 the tail-race just below the mill. The rock is lifted into a low 

 ridge which gradually dies away toward the quarry. The effects 

 of the compression are most marked near the big pier. Here 

 the rock on one side of the fracture is lifted nearly a foot, 

 while on the other side it has fallen back nearly into its ori- 

 ginal position, leaving a fault of eight inches. Along the line 



* See this Journal, xxxix, 220, 1890. 



