Editorial Comment. -T'.i 
of the marine Champlain deposits, overlying coastal portions 
of the glacial drift, it sees an effort of the earth to regain tin- 
state of isostasy, or flotation of the crust on the heavier mo- 
bile interior which is capable of Mow whether it be solid or 
molten. 
EDITORIAL COMMENT. 
The Columbian Exposition. 
77/c Harvard University Geological Exhibit, 
In gathering together materials for an exhibit, the intention 
of the geological department was to show as far as possible 
the methods of teaching, the working resources of the depart- 
ment, and student products. A more showy exhibit might 
have been made had the exhibition collections and libraries 
been resorted to, but the educational value would have been 
lost. It was evident that from the nature of the case, as well 
as the small space available, only a qualitative idea of geolog- 
ical teaching could be given, so the observer must gain his 
idea of the whole from suggestive samples. Finally the sam- 
ples chosen were fair representatives of resources, selected as 
they could be spared, and at the same time fully illustrating 
some points in the teaching of geology. The care taken in the 
selection and arrangement of materials and in the explana- 
tion of the exhibit gained for it an award of merit. 
Of the elementary courses the one taken by the greatest 
number of students is a lecture course with illustrations by 
lantern slides, photographs and specimens. A set of photo- 
graphs showing wave action was exhibited as the sample of 
illustration. For students having a further interest in geol- 
ogy there is an elementary laboratory and field course whose 
scheme of lectures, laboratory work and excursions was set 
forth in detail by means of a large notice. The kind of ma- 
terials used was shown by plaster models, maps, diagrams, 
photographs and rock specimens. Geological maps ami sec- 
tions made by students in the chiss were shown as products. 
The intermediate geological course, which eon>ist> of lec- 
tures, field work and reports, though employing lantern views. 
