rica--but it is MORE important to know about the
industrial life of your country--because when most of you go out into
the world you will become active figures in the making, buying and
selling of things.

The Calumet Baking Powder factories, in Chicago and East St. Louis are
the largest, most modern and sanitary plants of their kind on earth.
More pounds of Calumet are sold than of any other brand of baking
powder.

That is because Calumet is the best purest, most dependable baking
powder made; makes the finest, most wholesome, tasty pies, cakes,
biscuits, doughnuts, etc.

You will find the same rule applies to everything you do in life. If
you do a thing better than any one else--your services will always
be in demand and you will surely be a leader in your line of work.
Calumet Baking Powder is sold at a moderate price--has more than the
usual leavening strength--and NEVER fails.

A slip in pound can tells how to get the beautifully illustrated
Calumet Cook Book.

* * * * *

VENUS PENCILS

_The largest selling QUALITY pencil in the world_

[Illustration]

As soft as you wish; as hard as you please; but always smoother than
you had dreamed. Any Venus Pencil you select glides over the paper
with a restful freedom from friction.

17 BLACK DEGREES, 3 COPYING

For bold, heavy lines 6B-5B-4B-3B
For writing sketching 2B-B-HB-F-H
For clean fine lines 2H-3H-4H-5H-6H
For delicate, thin lines 7H-8H-9H

PLAIN ENDS, PER DOZ. $1.00
RUBBER ENDS, PER DOZ. 1.20

VENUS ERASERS

12 SIZES

[Illustration]

Of the same superb quality as the Venus Pencil

_Send for free sample._

_At all Stationers and Stores_

American Lead Pencil Co.
220 Fifth Ave., N. Y.
_and London, Eng._

* * * * *

Transcriber's Notes:

page 238: changed "diagramed" to "diagrammed" (As there diagrammed,
the electricity passes out...)

page 253: the Morse telegraph code is as in the original; this is not
the modern International Morse code

Page 412, changed "conrcete" to "concrete" (... shall express this
ideal in a very concrete way.)

General: variable spelling of iodin/iodine in the original has been
preserved

General: spelling of dioxid and chlorid in the original has been
preserved

End of the Project Gutenberg EBook of Common Science, by Carleton W. Washburne