I20 CARNEGIE INSTITUTION OF WASHINGTON. 



The actual amount of pressure required to deform rocks and the 

 amount of internal friction which they developed was also studied, 

 four tj'pical rocks being selected for this purpose, namely, Carrara 

 marble, Coxeyville dolomite, "Belgian block," and Baveno granite. 



As the cubic compressibility of rocks is a property which has an 

 intimate bearing on rock flow, a series of determinations of this 

 compressibility was made in the case of i6 t^^pical rocks, including 

 granites, various basic eruptives, limestones, etc. Apparatus has 

 also been installed for the purpose of extending this experimental 

 work on rock deformation to the harder crystalline rocks, and a 

 study of the deportment of granite, gabbro, etc., under conditions of 

 very high temperature and pressure is now about to be made. 



Q. K. Gilbert, Washington, D. C. Grant No. 126. For preparing 

 plans for investigating snbtcrranea^i temperatures. $1,000. 



Abstract of Report. — Dr. Gilbert has considered the question of 

 the best locality for drilling a deep well in rock of a uniform char- 

 acter, and reports that he has investigated the question of a suitable 

 site («) by formulating the conditions to be satisfied; {b) by a series 

 of inquiries and consultations with geologists familiar with the 

 structure of various districts east of the Great Plains ; (t) by a per- 

 sonal visit to the district which appeared from description most 

 likely to afford a satisfactory site. As a result of this investigation 

 he reports that the Lithonia district, Georgia, both appears preferable 

 to all other districts of which he has secured information and does in 

 fact well satisfy the conditions requisite for a successful boring. No 

 effort was made to choose a precise spot, but the natural conditions 

 are there favorable over so large an area that the selection of a 

 particular spot can be made in view of local economic conditions. 



A reliable well-boring compan}^ has furnished an estimate and is 

 willing to guarantee the completion of a well 6,000 feet in depth. 

 Dr. Gilbert recommends that in view of the importance of such a 

 project it be undertaken. The reasons given by him are printed in 

 the papers accompanying this report, pages 259-267. 



HISTORICAL RESEARCH. 



Annie Heloise Abel, New Haven, Conn. Grant No. 191. For 



investigating the early Indian policy of the U7iited States. $150. 



Abstract of Report. — The purpose of the investigation, as first 



undertaken, was to determine the causes and methods of moving 



the Indians from the eastern to the western side of the Missi.ssippi. 



