36 ANNUAL REPORT OF THE 



REPORT ON THE GEOLOGICAL COLLECTION 



By Robert W. Sayles. 



During the year models have been purchased for the dynamical 

 and structural exhibits. A relief model, by G. C. Curtis, showing 

 Valpariso after the earthquake of 1906, illustrates the typical 

 manner in which masonry houses fall in heavy shocks. The idea 

 was conceived by Professor J. B. Wood worth. A model of the 

 frame of a Japanese earthquake-proof house, made by J. P. Deagle, 

 under the direction of the Assistant is also on exhibition. A 

 naturalistic model of Pulpit Rock, Eastern Point, Nahant, the 

 first naturalistic model of a rock ever made, was purchased of 

 G. C. Curtis. 



About fifty specimens of fossils have been added to the historical 

 collection. Eighteen photographic copies of the drawings of 

 Charles R. Knight, illustrating extinct reptiles and mammals, 

 have been hung in the historical cases. 



Specimens of the tillite found at Hyde Park and Squantum have 

 been placed on exhibition in the case devoted to glaciers, and for 

 comparison, a specimen of tillite from the Cambrian or Pre- 

 Cambrian of China, the kind gift of Bailey Willis, is also shown. 



One exhibition case has been built ; it is well filled with specimens 

 illustrating jointing. 



In one of the two windows between the southwest room and the 

 hall, there have been placed six transparencies, showing the part 

 played by water in the tearing down of the lands, as exemplified 

 by rivers, glaciers, and waves. 



In the spring of 1911, I made a trip to western Virginia, and 

 collected a number of fossils from the Ordovician, Silurian, and 

 Devonian systems. 



Publication. August 1, 1910-July 31, 1911. 



Sayles, R. W., and La Forge, L. 

 The glacial origin of the Roxbury conglomerate. Science, 18 

 November, 1910, new ser., vol. 32, p. 723-724. 



