MUSEUM OF COMPARATIVE ZOOLOGY. 27 



i 



preparation of a geological map of the Middlesex Fells on a scale 

 of 500 feet to the inch, which map, together with field notes, 

 reports, and specimens, has been filed in the Laboratory of ad- 

 vanced geology. The working facilities of this Laboratory have 

 been improved by the addition of a storage case and by the addi- 

 tion of numerous specimens to the working collection of rocks 

 illustrating the geology of the Metropolitan District. Dr. Mans- 

 field spent the summer in Montana, in the Bridger Range, as 

 instructor in charge of Geology S2, and later in the Crazy Moun- 

 tains, as assistant to Professor Wolff. 



Dr. Mansfield's thesis on Conglomerates has been published in 

 a Bulletin of the Museum, and a separate paper of a didactic char- 

 acter has been prepared for publication in the Journal of geology. 

 Considerable time was given during the year to the laboratory and 

 field work in elementary courses. 



Publications. August 1, 1906-July 31, 1907. 



D. W. Johnson. 



Report on a geological excursion through New Mexico, Arizona, 



and Utah, summer of 1906. Technology quart., December, 1906, 



vol. 19, p. 408-415. 

 Drainage modifications in the Tallulah district. Proc. Post. soc. nat. 



hist., February, 1907, vol. 33, p. 211-248, pis. 27-28. 

 River capture in the Tallulah district, Georgia. Science, 15 March, 



1907, new ser., vol. 25, p. 428-432. Separate, 10 pp. 

 A recent volcano in the San Francisco mountain region, Arizona. 



Bull. Geogr. soc. Phil., July, 1907, vol. 5, p. 6-11, 2 pis. 

 Volcanic necks of the Mount Taylor region, New Mexico. Bull. 



Geol. soc. Amer., July, 1907, vol. 18, p. 303-324, pis. 25-30. 

 Reviews in Amer. nat., Science, and Pulletin Amer. geogr. society. 



G. R. Mansfield. 



The origin and structure of the Roxbury conglomerate. Pull. 

 M. C. Z., November, 1906, vol. 49, p. 89-271, 7 pis. 



R. DeC. Ward. 



The characteristics of the zones. I. The tropics. Joum. geogr., 



1906, vol. 5: September, p. 302-319. II. The temperate zones. 



Loc. cit., October, p. 337-353 ; November, p. 375-405. III. The 



polar zones. Loc. cit., December, p. 433-450. 

 Changes of climate. Popular sci. monthly, November, 1906, vol. 



69, p. 459-470. 



