15 



Physical Geography and Climate of New England. Two chapters in 

 Scudder's Butterflies of New England. 1888. 



The Structure of the Triassic Formation of the Connecticut Valley. 

 Seventh Annual Report, U. S. Geol. Survey, 1888, pp. 445-490. 



The Faults in the Triassic Formation near Meriden, Connecticut. A 

 Week's Work in the Harvard Summer School of Geology. Bulletin of the 

 Museum, Vol. XVI. (Geol. Series, Vol. IL), pp. 61-87. With Five Plates. 



The Ash-Bed at Meriden and its Structural Relations. Proc. Meriden 

 (Conn.) Scientific Assoc., 1889. 



Topographic Development of the Triassic Formation of the Connecticut 

 Valley. Amer. Journ. Science, Vol. XXXVII., 1889, pp. 423-434. 



Geographic Methods in Geologic Investigation. Nat. Geogr. Mag., 

 Vol. I., 1888, pp. 11-26. 



The Rivers and Valleys of Pennsylvania. Nat. Geogr. Mag., Vol. I., 

 1889. 



Methods and Models in Geographic Teaching. Abstract of Lecture 

 delivered before the University Scientific Association of Johns Hopkins 

 University. Johns Hopkins Univ. Circular, No. 72, p. 62. 



Synclinal Mountains and Anticlinal Valleys. Science, Vol. XIL, 1888, 

 p. 320. 



A River Pirate. Science, Vol. XIII., 1889, pp. 100-109. 



Souie American Contributions to Meteorology. A Lecture delivered 

 before the Franklin Institute of Philadelphia. Journ. Franklin Inst., Vol. 

 CXXVII., 1889. 



Six students worked in Petrograph}^ during the year, and 

 occasional assistance was given to others. The equipment was 

 increased by the purchase of two new petrograpliical micro- 

 scopes, and of a lathe for sawing thin slices of rock by the 

 diamond saw. 



Mr. Wolff completed and prepared for publication his Report 

 on the Geology of Hoosac Mountain and adjacent Territor}?-, 

 dealing with the geology and petrography of a portion of the 

 Green Mountains. During the past summer, in connection with 

 the United States Geological Survey, he has spent two months in 

 an exploration of the Crazy Mountains, Montana, investigating 

 the field relations of the nepheline rocks discovered there by him 

 in 1883, to which, as types of a new family of rocks, Professor 

 Rosenbusch gave the name of Theralite. The results have been 

 very satisfactory, proving that these are true plutonic rocks, 

 occurring in large laccolites. This and other interesting petro- 

 graphical discoveries will be announced later in detail. 



