MUSEUM OF COMPARATIVE ZOOLOGY. 21 



of the Cambridge slate and adjacent rocks. The class in Geology 

 22 made a reconnaissance survey of 60 square miles between 

 Waltham and Melrose. 



Two geological models have been added to the collections, — 

 one of Crater Lake, Oregon, and one of St. Mary's Butte, Cali- 

 fornia. A few rock specimens have been purchased to fill out 

 the labelled series, and to add to the unlabelled series for indi- 

 vidual study. Advantage was taken, in 1899, of the summer school 

 expedition in the West to obtain specimens of the lithophysae and 

 rhyolite glass, of hot spring deposits, of tufa from the shores of 

 Lake Bonneville at the northern end of Oquirrh Mountains, and 

 of granite from the summit of Pike's Peak, Colorado. A geologi- 

 cal formation table has been printed by hand on a roller curtain, 

 on the basis of the divisions in use by the U. S. Geological Sur- 

 vey, with the addition of such foreign formations as are referred 

 to in the instruction given in Courses 8 and 16. It is planned 

 to extend the use of such diagrams by means of frames, to which 

 the diagrams can be attached as in ordinary window-curtain 

 fixtures. These frames and diagrams are readily transferred 

 and stored, and therefore serve the needs of the laboratory and 

 the geological lecture room. A set of photographic enlarge- 

 ments has been made of De Lapparent's charts of the distribution 

 of land and sea during the principal geological epochs. 



Mr. Woodman, assistant in the Geological Laboratory, worked 

 during the winter upon a report of Nova Scotia geology. He 

 also conducted, under Professor Shaler's direction, the elementary 

 Summer Course in Geology in Cambridge in both of the past two 

 years. In the summer of 1899 an advanced field course in geology 

 was conducted by Professor Shaler and Mr. J. B. Wood worth in 

 the Rocky Mountains, chiefly in the Yellowstone Park district. 

 This course was attended by thirteen students, all members of the 

 University. In the summer of 1900 Mr. J. B. Woodworth took 

 charge of the field class at Catskill, N. Y., on the 4th of August, 

 and proceeded to Meriden, Conn., spending the time until the 16th 

 of the month in a study of the geologic structure of the Triassic 

 valley. The previous four weeks of instruction in this course 

 were given by Prof. A. P. Brigham, of Colgate University, to five 

 students. Three students completed the course. 



In the summer of 1899, Messrs. Burr, Boynton, and Goodrich, 

 advanced students in the department, under Professor Shaler's 



