20 ANNUAL REPORT OF THE 
held a meeting in the Geographical Laboratory. Professors 
Davis and Ward gave addresses, and a number of lantern slides 
and of laboratory and lecture materials used in the courses in 
Meteorology were exhibited. 
Professor J. B. Woodworth gave, as in former years, Courses 5 
and 8 and a new half-course in the physical geology of the Car- 
boniferous period. For a number of reasons it seemed desirable 
to rearrange the first and second years’ work in General Geology 
and to make the fullest use of the large laboratory devoted to 
Geology on the second floor of the Museum. For several years 
large numbers of students who do not take the upper courses 
dealing with Historical Palaeontology have taken Courses 4, 5, 
and 8, the subject-matter of which is mainly Dynamic Geol- 
ogy, though in Course 8 about one-half of the lectures have in 
recent years been devoted to the physical features of the great 
geological rock systems and laboratory exercises involving the 
study of typical rocks, geological maps, and sections; and the 
careful study of monographic reports have been gradually intro- 
duced to supplement the lectures and field work. The proposal 
to combine the laboratory and field work with the organized 
staff of assistants which has in recent years been formed in 
Course 5 with the lectures of Professor Shaler in Course 4 as a 
half-course in the first half-year, and to offer as a half-course in 
elementary Historical Geology in the second half of the year the 
instruction in that matter heretofore given in Course 8 was ap- 
proved by the Committee on Instruction and adopted by the 
Faculty. This plan has the merit of affording the student who 
has only one year to devote to Geology the opportunity of obtain- 
ing an elementary knowledge of the whole field of General Geol- 
ogy in both its dynamic and historical phases. Considerable 
time has been given this year to bringing together the mate- 
rials necessary for the laboratory work in this new course. From 
the materials already in the collections of the laboratory and by 
the transfer of several sets of rocks from the Frazar collection 
through the kindness of Professor Wolff, twelve sets of historical 
specimens have been begun illustrating, as yet in an incomplete 
way, the principal rock systems from the Archean to the Pleistocene 
inclusive. A duplicate set is placed at each laboratory table for 
the simultaneous use of six students. The laboratory is indebted to 
Professor R. T. Jackson for the transfer of several duplicate fossils, 
a few typical forms of which from each principal rock system it 
