404 EDITORIAL 



expense, which he had turned over formally to Yale University 

 before his death, he left a large amount of material belonging to 

 the United States Geological Survey, which had been collected 

 under his direction and was undergoing description. It is prob- 

 ably true that no other one man has ever accumulated such a 

 vast collection of remarkable and well preserved fossil verte- 

 brates. H. S. W. 



Mr. Thomas Jones has recently completed a reduction of 

 his model of the earth which possesses sufficient merit and is 

 of sufficient interest to geologists to warrant notice. The ver- 

 tical exaggeration of his former globe was 36 to I. The present 

 is a reduction to 18 to I. This relieves the exaggeration of 

 most of its objectionable features and still leaves the relief 

 impressive enough for lecture-room purposes. The first copy 

 made has now been in use by the writer for several weeks with 

 satisfactory results. The hypsometric data given by the Chal- 

 lenger Report have been followed for the oceanic basins. 



T. C. C. 



To meet an expressed desire for advanced summer courses in 

 the fundamental principles of geology and glaciology suited to 

 college teachers and advanced students, two courses will be 

 offered during the first term of the summer session, July 1 to 

 August 1, at the University of Chicago by Mr. Chamberlin. The 

 first will consist of a discussion of basal questions and unsolved 

 problems in geology taken up in historical order, so as to con- 

 stitute in some measure a review of geological history. Follow- 

 ing the method of multiple working hypotheses these questions 

 will be discussed in the light of alternative theories. Some special 

 attention will be given to a new series of hypotheses based upon 

 the slow growth of the earth by meteoroidal accretions, these 

 hypotheses being of such a nature as to develop with peculiar 

 facility the strength and weakness of existing hypotheses and 



