96 J. W. Powell—Organization and Plan 
PALEONTOLOGY. 
Before giving the outline of the plan for the general geologic 
survey, it will be better to explain the accessory plans an 
organizations. There are in the Survey, as at present organized, 
the following paleontologic laboratories : 
1. A laboratory of vertebrate paleontology for formations 
other than the Quaternary. In connection with this oe 
there is a corps of paleontologists. Professor O. C. Mar, 
in charge. 
_ 2. There is a laboratory of invertebrate paleontology of 
Quaternary age, with a corps of paleontologists, Mr. Wm. H. 
Dall, being in ) char ze. 
Cenozoic and Mesozoic age, with a . e of paleontologists. 
4. There is a laboratory of th vertebrate paleontology of 
Paleozoic age, with a corps of paleontologists. Mr. C. D. 
Walcott is in charge 
5. There is a febonitity of fossil botany, with a corps of 
paleobotanists, Mr. Lester F. Ward being in charge. 
The paleontologists and paleobotanists connected with the 
laboratories above described, study and discuss in reports the 
fossils collected by the general poreers in the field. They 
also supplement the work of the field geologists by making 
special collections in sith distions and at critical hori- 
zons; but the paleontologists are not held responsible for 
areal and structural geology on the one hand, and the geolo- 
Send are not held responsible for paleontology on the other 
d. In addition to the large number of paleontologists on 
the regular work of the Geological Survey, as above described, 
several paleontologists are engaged from time to time to make 
special studies. 
CHEMISTRY. 
There is a chemic laboratory attached to the Survey, with 
a large corps of chemists engaged in a great variety of re- 
searches relating to the constitution of waters, minerals, ores 
and rocks. A part of the work of this corps is to study the 
methods of metamorphism and the aragenesis of minerals, — 
and in this connection the chemists ie work in the field; but 
to a large extent they are occupied with the study of the mate: 
terials collected by the field geologists. Professor F. W. 
Clarke is in charge of this department. 
