PROCEEDINGS OF SCIENTIFIC SOCIETIES. 559 
would, in a liquid form, rise to 1,800 feet on the same area. If one-fifth 
of the earth was enveloped in congealed water, and four-fifths of its 
surface was free, the transfer of the liquid portion from the sea to the 
land, where it should remain, would depress the sea one-fifth of the 
vertical distance above assumed, for the water produced by the melt- 
ing ice. i 
Dynamical results may have followed the accumulation of conti- 
nental ice. The continent of Greenland is considered to be settling at 
- a perceptible rate, —of necessity a sinking of one part of the earth’s 
surface involves a rise in another, and generally an adjacent part, 
— accordingly the island of N Annlan. is reported to be rising. - 
Professor Hall and other geologists claim that accumulations of 
detritus may reach a point where, by weight alone, depression must 
follow. If this theory is tenable, a load of ice would produce like re- 
sults 
I present this idea for the consideration of geologists, when they ` 
study the phenomena of the fresh-water drift and terraces of the 
Lake Champlain and the St. Lawrence. In the ge over vast 
t 
spaces extending to the Rocky Mountains, ae west of the 
lakes, there are no known elevations exceeding pact above tide. 
A sinking seems to have taken place over this enon while the sea- 
coast as far as the east end of Lake Ontario was rising, the axis or 
line of rest being near the middle of this lake, and its beating nearly 
across it. 
CALIFORNIA ACADEMY OF NATURAL Sciences. San Francisco, July 
1, 1867.—The eggs, caterpillar, female and cocoon, of the California 
silk-worm (Saturnia Californica, or Euryalus of Boisduval), were 
presented by Dr. ocemeaebcndy. who remarked that the gorge of eggs 
of this silk-worm is from two hundred to two hundred and fifty. The 
female Jays, on an tae from seventy to eighty per aad. Three 
thousand eggs weigh an ounce. The caterpillar, direct from the egg, 
is more lively than that of the Chinese silk-worm, and hardly keeps in 
its place. The silk produced by this worm is stronger than that of 
the Chinese, and is indigenous to California. Living on the Ceano- 
_ thus, it is well worth the attention of our silk-growers, as perhaps in 
eeding it on the mulberry a finer quality of silk would be ee 
The eggs were obtained from a female caught in the garden 
a Brewery, Second street, in this city, on the 10th of jae 
e eggs were hatched on the 30th of the same month. The cater- 
pillar requires generally from two to two and a half months before 
making its cocoon. 
