13 



During the summer of 1889, twenty-five students received 

 systematic instruction in field-work. This instruction was given 

 in two summer schools, that of Elementary Geology, which was 

 taught at Cambridge, and an advanced course, taught in the 

 States of New York, Connecticut, and Massachusetts. Instruc- 

 tion in these courses was given by N. S. Shaler, W. M. Davis, 

 and T. W. Harris, with the assistance of Prof. H. S. Williams 

 of Cornell University, who collaborated with the other instruc- 

 tors in the work done in the Genesee Valley. 



During the year, the following papers of a scientific nature 

 have been published by N. S. Shaler: — 



1. Report oti the Geology of Martha's Vineyard. Seventh Annual 

 Report of the Director of the United States Geological Survey, 1885- 

 86. Washington, 1888, pp. 297-363. With Illustrations and Two 

 Maps. 



2. On the Geology of the Cambrian District of Bristol County, Massa- 

 chusetts. Bulletin of the Museum of Comparative Zoology, Vol. XVI. 

 No. 2, pp. 13-41. With Map and Two Plates. Cambridge, October, 

 1888. 



3. On the Occurrence of Fossils of the Cretaceous Age on the Island 

 of Martha's Vineyard, Mass. Bulletin of the Museum of Comparative 

 Zoology, Vol. XVI. No. 5, pp. 89-97. With Two Plates. 



4. Chance or Design. The Andover Review, August, 1889, pp. 1-17, 



5. Introduction to Bulletin No. 46, U. S. Geological Survey. On the 

 Nature and Origin of Deposits of Phosphate of Lime, by Dr. R. A. F. 

 Penrose, Jr. 



6. Administrative Report of the Atlantic Coast Division of the United 

 States Geological Survey. Annual Report of Director for 1885-86 (pub- 

 lished in 1888), pp. 61-65. 



7. Effects of Permanent Moisture on certain Forest Trees. Science, 

 March, 1889, pp. 176, 177. 



Owing to absence from Cambridge during the greater part of 

 the past year, it was impossible for Mr. Davis to carry on the 

 first course in Physical Geography (Natural History 1), and it 

 was therefore placed in the hands of Mr. T. W. Harris, Instructor 

 in Geology. Laboratory exercises and recitations were main- 

 tained once a week through the year, in addition to the regular 

 lectures, with an attendance of forty students. 



The advanced course in Physical Geography (Natural History 

 20) was in charge of Mr. Davis, with an attendance of five 



