re the vapors are condensed in part into mineral oil, and the
rest remains in a state of natural gas. The petroleum strata are
generally met with in the vicinity of mountains, and it may be granted
that geological upheavals have dislocated the ground in such a way as to
permit of the [Transcriber's Note: The original text reads 'admistoin']
admission of water to great depths. If the center of the earth contains
great masses of metallic carburets, we may, in case this theory is
verified, count upon an almost inexhaustible source of fuel for the day
when our coal deposits shall fail us.

How Vaseline is Purified.--The residuum from which vaseline is made
is placed in settling tanks heated by steam, in order to keep their
contents in a liquid state. After the complete separation of the fine
coke it is withdrawn from these tanks and passed through the bone
black cylinders, during which process the color is nearly all removed,
as well as its empyreumatic odor.

The Latest and Best Process Employed by Cutters and Others in Etching
Names and Designs on Steel.--Take copper sulphate, sulphate of alum
and sodium chloride, of each 2 drachms, and strong acetic acid 1-1/2
ounces, mixed together. Smear the metal with yellow soap and write
with a quill pen without a split.

The History of the Discovery of Circulation of the Blood recapitulated,
divides itself naturally into a series of epoch-making periods: 1. The
structure and functions of the valves of the heart, Erasistratus, B.C. 304.
2. The arteries carry blood during life, not air, Galen, A.D. 165.
3. The pulmonary circulation, Servetus, 1553. 4. The systemic circulation,
Caesalpinus, 1593. 5. The pulmonic and systemic circulations, Harvey, 1628.
6. The capillaries, Malpighi, 1661.

How to Make Hand Fire Grenades.--Make your hand grenades. Fill
ordinary quart wine bottles with a saturated solution of common salt,
and place them where they will do the most good in case of need. They
will be found nearly as serviceable as the expensive hand grenades
you buy. Should a fire break out, throw them with force sufficient to
break them into the center of the fire. The salt will form a
coating on whatever object the water touches, and make it nearly
incombustible, and it will prove effectual in many cases, where a fire
is just starting, when the delay in procuring water might be fatal.

How the Kind of White Metal is Made That is Used in the Manufacture
of Cheap Table Ware.--How same