14 
The advanced course in Physical Geography (N. H. 20). was 
taken by one student, and remained in charge of Professor Davis 
throughout the year. The work was chiefly an investigation 
of the physical geography of New Jersey, as illustrated by the 
colored maps of that State. A brief excursion was made in 
Northern New Jersey in the spring. 
During the winter, Professor Davis delivered ten lectures on 
the Physical Geography of the United States before the Teach- 
ers’ School of Science, in Boston; these were illustrated by a 
series of thirty large models, or relief maps, designed to repre- 
sent typical geographic forms, and prepared especially for use in 
class teaching. 
The course in Petrography has been pursued by eight regular 
students throughout the year. Instruction and assistance was 
occasionally given to others engaged in geological work. A 
paper by Dr. Wm. H. Hobbs, “ On the Petrographical Character 
of a Dike of Diabase in the Boston Basin,” was published during 
the year in the Museum Bulletin. 
The Laboratory equipment has been increased by a large 
Fuess reflecting goniometer, three new microscopes, and minor 
articles, as well as by the addition of new specimens and slides 
to the rock collections. 
The spare time of the instructor during the summer and 
winter was taken up by the field and office work, in connection 
‘with a final report on the Geology of Hoosac Mountain and 
the adjoining region, which, it is hoped, will be ready for pub- 
lication the coming winter. These investigations have also 
been extended to other parts of the Green Mountains. 
