1880. | Microscopy. 225 
world, in the form of a map of the Yellowstone Park on a scale 
of two miles to an inch,a scale sufficiently large to show all 
details necessary to the geologist, or the traveler. The topogra- 
phy is represented by contour lines, at approximate intervals of 
one hundred feet. This map, as well as the others published by 
this survey, are admirable illustrations of relief-effect by means of 
contours; and they not only express the relief, but the absolute 
and relative elevations. . 
From a study of this map, we find that the greater part of the 
surface of the Park consists of high rolling plateaus, broken by 
stream beds, cliffs and cafons. Several small groups of moun- 
tains diversify the surface, among them the Red mountains, in 
the southern part, rising two thousand feet above the general 
level, or more than ten thousand feet above the sea—and the 
Washburn group, near the middle of the Park. This group has 
the form of a horseshoe, opening towards the east. The eastern 
border of the Park is occupied by a high, rugged range, to which 
has long attached the name of Yellowstone Range. Index peak; 
the highest measured peak in this range, exceeds 11,700 feet in 
height. In the north-western corner of the Park is the southern 
extremity of the Gallatin range, culminating in Electric Peak, a 
Magnificent summit, 11,155 feet above the sea, which overlooks 
almost the whole Park. 
The mean elevation of this reservation appears to be not far 
from 8000 feet, an elevation so great in this latitude as to pre- 
Suppose an almost arctic climate. The lowest point within its 
limits is at the mouth of Gardiner’s river, on the Yellowstone, 
which is 5360 feet. ` 
-Marked features of the reservation are the low, indefinite divides 
and the abundance of lakes and marshes, In several cases we 
note marshes extending across divides and making “two ocean 
rivers,” phenomena by no means as uncommon as are popularly 
Supposed. The lakes, principal among which are Yellowstone, 
Shoshone, Lewis and Heart, gover nearly 200 square miles out of 
bi total area of the park, which is estimated at 3312 square 
miles, 
Many’ newly discovered groups of hot springs and geysers 
appear, for the first time, on this map, among which should be 
mentioned the large and fine groups near the head of Gibbon’s” 
fork of the Firehole, the discovery of which has been previously 
Noticed DEN 
The engraving of these maps, by Bien, of New York, is one of 
best specimens of his very excellent work. 
MICROSCOPY.’ ea 
HINTS on THE PRESERVATION OF LIVING OBJECTS, AND THEIR 
EXAMINATION UNDER THE MicroscoPe.—I will now give a short 
Summary of the most useful apparatus for the examination of w 
> ; This department is edited by Dr. R, H. Warp, Troy, N. Y. a 
