Correspondence. 259 
region contains extensive areas of serpentine, and instances are given 
of the granitic rocks having been intruded into the serpentine to prove 
that the granites are newer, in accordance with the determined relations 
of these rock types in the Sierra Nevada region, and the reverse of the 
supposed relation between the granite and serpentine of the Coast 
ranges. 
The black slates of the Klamath region are divided into two dis- 
tinct series, referred to as the lower slates and the upper slates. The 
former are considered DeYono-Carboniferous in age, being in part 
equivalent to the Calaveras formation. The latter are correlated, on the 
evidence of their lithology and their structural relations, to the lower 
slates and to a certain extrusive greenstone formation of the Sierra 
Nevada region, with the Mariposa formation of late Jurassic age. The 
intrusion of granite occurred later than the deposition of these upper 
slates. Also it is shown that the granites are much older than the 
Chico formation resting on them as thc}' must have suffered much 
erosion prior to the Chico epoch. 
It is finally concluded that the weight of evidence places the gran- 
itic intrusion just about at the close of the Jurassic period. The effect 
of the agreement is to show that there is a sound basis for the inference 
heretofore entertained that the Klamath mountains belong rather to 
the same system as the Sierra Nevada instead of the Coast ranges, and 
may be considered a sort of out-lier to the former. 
Berkeley, Cal. Osc.\k H. Hershev. 
A Nation.vl Museum for C.\n.\d.\. The growth and progress of the 
work done by the staff of the Geological survey of Canada have reacheil 
that point in the history of this classic state institution, which dates 
from 1842, when the headquarters and museum on Sussex street have 
become not only over-crowded and limited in accommodation, but also 
positively unsafe. The mass of specimens displayed has long ago 
reached its crisis, and special orders from the Honorable the Minister 
of Public Works have compelled the Museum proper to be lightene<i 
as far as possible. Besides this, a large series of wooden posts — in 
the neighborhood of sixtj^ — have been placed at proper intervals on thre:; 
floors to act as .so many props and supports for the collections of ores, 
minerals and rocks of economic value, etc., in the Dominion of Can- 
ada. The building now occupied by the Staff and Museum is totally 
inadequate for the requirements of the times. It is practically impos- 
sible and unsafe to exhibit any discovery made or record the numerous 
finds and donations received in a tangible or accessible manner. There 
are thousands of specimens in the possession of the Geological Depart- 
ment which are rendered quite inaccessible, owing to lack of space, and 
an effort is now being put forth towards obtaining a suitable and fire- 
proof building in which the products of the earth in Canada, whether 
as regards its mines, forests, and waters, will be exhibited to advantage. 
In looking over the Report of the U. S. National Museum, drawn 
up by the Acting Assistant Secretary, the Hon. C. D. Walcott, the vari- 
ous divisions and subdivisions of work are given in such a manner as to 
