THE SCIENTIST. 
185 
two sub-categories, deformation, in- 
cluding elevation' and depression, 
and gradation, including deposition 
and degradation. 
The subordinate category con- 
tains five sub-categories as follows: 
extravasation, alteration, glaciation, 
eolation and vital action. 
Extravasation contains two sub- 
categories, ell ux and collapse; altera- 
tion contains two sub-categories, 
litbification and delithilication; also 
glaciation contains two sub-catego- 
ries, glacial construction and glacial 
destruction; and also eolation con- 
tains two sub-categories, eolic con- 
struction and eolic destruction, and 
vital action contains various con- 
structive and destructive processes. 
The development of mountains and 
continents ^vould be in, according to 
the above classification, the principal 
category, first sub-category deforma- 
tion, second sub- category elevation 
or depression. 
The changes in the terrestrial sur- 
face caused by aqueous erosion 
would be in the principal category, 
first sub-category gradation, second 
sub-category degradation or deposi- 
tion. 
The changes in the terrestrial 
surface caused by volcanic action 
Avould be in the su[)ordinate cate- 
goi-y, first sub-category extravasa- 
tion, second sub- category efiux or 
volhipse. 
The changes in the earth arising 
from percolating water, air or other 
gases would l)e in the subordinate 
categor}^, first sub-category, altera- 
tion, second sub-category litbifica- 
tion and delithification. 
The changes in the earth's surface 
caused by glacial action would be in 
the subordinate category, first sub- 
category glaciation, second sub-cate- 
gory, glacial construction or glacial 
destruction. 
The changes in the earth's surface 
made by currents or wave action 
would be in the subordinate cate- 
gory, first sub-category eolation, 
second sub-category eolic construc- 
tion or eojic destruction. 
The changes in the earth produced 
by organic life would be in the sub- 
ordinate category, first sub-category 
vital action, second sub-category 
various constructive or destructive 
processes. 
Salton Sea. 
The "Salton Sea," according to 
Dr. P. G. Cotter, of Yuma, is a per- 
manent inland lake and will event- 
ually attain an area of nearly one 
thousand square miles with a depth 
of about three hundred feet. 
Engineers have examined the 
break through which the river is 
flowing into the basin, where the 
lake is forming and have found that 
the channel is cut away about six 
feet deep at jjresent but is contin- 
ually increasing by erosion; the 
river inlet is elevated one hundred 
and forty- three feet above the sea 
level, and the lake inlet is one hun- 
dred and thirty-seven feet above sea 
level, and the elevation of the basin 
is two hundred and sixty-three feet 
below the sea level; these facts are 
the evidence on which Dr. Cotter 
bases his opinion and is sufiicient to 
warrant his conclusions. 
