44 



ANNUAL REPORT OF THE 



REPORT ON THE GEOLOGICAL COLLECTION. 



By Robert W. Sayles. 



During the year there have been added 245 specimens of rock, 

 of which 116 have been purchased. For the others acknowledg- 

 ments are due to Professors J. B. Woodworth, J. E. Wolff, R. T. 

 Jackson, Messrs. F. H. Lahee, G. R. Mansfield, J. W. Eggleston, 

 A. R. Cunningham, and C. E. Chandler. The Standard Oil 

 Company of N. Y. gave thirteen specimens of petroleum, crude 

 and refined. There was also an anonymous gift of 100 specimens 

 of igneous rocks. 



The specimens purchased show the different colors of the more 

 common rocks. There are thirty-five samples of marble, twenty- 

 five each of granite, limestone, and sandstone, and six of slate. 

 These are arranged to aid in determining accurately the colors of 

 . rocks in the field. 



A polished slab of Quincy granite showing contact phenomena, 

 discovered by Dr. Charles Palache, has been purchased and is 

 ready for exhibition. 



Prof. J. B. Woodworth has kindly loaned his collection of por- 

 traits of many of the founders of geology. 



Mr. C. E. Chandler, of Norwich, Connecticut, gave a stalactite 

 six inches long found under the arch of an old stone dam near Nor- 

 wich. The dam was built in 1829, and the arch had remained 

 undisturbed. 



Printed descriptions, seventeen in number, of geological proc- 

 esses have been placed in the cases. The white plaster mount de- 

 vised by Dr. Henry F. Libby, has been adopted for displaying 

 specimens; about 300 are in use. 



The Assistant has equipped the exhibition rooms and part of 

 the hallway with Nernst electric lights. 



Three new wall cases are under construction. 



I spent the summer of 1908 in the Canadian Rockies and on 

 Vancouver Island. At Banff, Alberta, fossils from the Carboni- 

 ferous limestone were collected, and many photographs taken. 



