no The American Geologist. August, idoi 
(b) Division of Mineralogy : 
F. W. Clarke, Honorary Curator. 
Wirt Tassin, Assistant Curator. 
Dr. L. T. Chamberlain, Honorary Custodian of Gems and 
Precious Stones. 
(c) Division of Stratigraphic Paleontology: 
Charles D. Walcott, Honorary Curator. 
Charles Schuchert, Assistant Curator, 
(i) Section of Vertebrate Fossils: 
F. A. Lucas, Acting Curator. 
(2) Section of Invertebrate Fossils : 
Paleozoic : Chas. Schuchert, Custodian ; Geo. H. Gir*^y, 
Custodian of Carboniferous Collections. 
Mesozoic : T. W. Stanton, Custodian. 
Cenozoic : W. H. Dall, Associate Curator. 
Chas A. White, Honorary Associate in Paleontology. 
(3) Section of Paleo-botany : 
A. C. Peale, Aid in Charge of Collections. 
Lester F. Ward, Associate Curator. 
F. H. Knowlton, Custodian of Mesozoic Plants. 
David White, Custodian of Paleozoic Plants. 
Considered in the order above given, the following- descrip- 
tive matter, compiled from the handbooks and annnal reports 
of the variotis curators and assistant curators, will be found of 
interest. 
Division of Physical and Chemical Geology, Sysfcinafic and 
Applied. It! this division consideration is given to the bring- 
ing together, and so far as is practicable, preparing an exhibi- 
tion of materials bearing itpon the history of the earth in its 
cosmical aspect and illustrative of its composition and struc- 
ture. Lack of space has prevented the carrying out of an ideal 
exhibition series, and from vear to year it has become nec- 
essary to withdraw some of the smaller and less striking ex- 
hibits and install in their places materials of more general in- 
terest. It is not to be understood, however, that the exhibits 
that are withdrawn are rejected. They are simpl}^ placed in 
storage, where they may be available for reference, or for ex- 
hibition when space shall be provided. 
The more important exhibits found here and which are of a 
nature, either on account of their size or rarity, as to seldom 
find their way into the smaller museums, are a chister of ba- 
saltic columns in the position in which they were formed (see 
pi. xiv) ; a large series of specimens illustrating (i) limestone 
caverns and associated phenomena (see pi. xt) ; (2) glaciers 
