13 



designed by Professor Albert Heira, of Zurich. These represent 

 a glacier in a lofty Alpine region ; a torrent in a mountain region 

 of less altitude ; a bold coast line, with bars and dunes ; and a 

 volcanic island with a variety of cinder cones and lava flows. 

 King's plaster models of Wisconsin have also been secured. A 

 number of valuable maps have also been purchased, among which 

 Haardt's Map of the Alpine System may be mentioned as the 

 most successful representation of a great mountain range. A 

 considerable number of smaller maps from various sources have 

 been mounted on cardboard for use in the class-room. 

 . During the period of the mid-year examinations, Professor 

 Davis visited Baltimore to deliver a short course of lectures on 

 Meteorology to the class in Physical Geography at Johns Hop- 

 kins University. In the April recess, he accompanied a party 

 of students to the valley of the Upper Passaic, in New Jersey, 

 to trace out the shore lines of a reputed glacial lake ; the evi- 

 dence discovered was incomplete, and somewhat contradictory. 

 An account of the excursion was read to the Harvard Natural 

 History Society by R. E. Dodge, of the Senior Class. 



The following papers have been published during the year by 

 W. M. Davis : — 



Structure and Origin of Glacial Sand Plains. Bull. Geol. Sci. Amer- 

 ica, Vol. I., 1890, pp. 192-202, Plate III. 



The Geographic Development of Northern New Jersey, by W. M. 

 Davis and J. Walter Wood, Jr. Proc. Bost. Soc. Nat. Hist., Vol. 

 XXIV., 1889, pp. 365-423. 



The Rivers of Northern New Jersey, with Notes on the Classification 

 of Rivers in General. Nat. Geogr. Mag., Vol. II., 1890, pp. 81-110. 



The Intrusive and Extrusive Triassic Trap Sheets of the Connecticut 

 Valley, by W. M. Davis and Charles Livy Whittle. Bulletin of the 

 Museum of Comparative Zoology, Vol. XVI. (Geol. Series, Vol. II.), 



1889, pp. 99-138. With Five Plates. 



Ferrel's Convectional Theory of Tornadoes, by W. M. Davis and 

 Charles Emerson Curry. Amer. Met. Journ., Vol. VI., 1889-90, 

 pp. 337-349, 418-431, 448-463. 



Dr. Hann's Studies on Cyclones and Anti-Cyclones. Science, May 30, 

 1890. 



An Outline of Meteorology. Abstract of Six Lectures delivered to the 

 Class in Physical Geography at the Johns Hopkins University in January, 



1890. Johns Hopkins University Circular, May, 1890. 



Secular Changes in Climate. A Paper read at the Eighteenth Meeting 



