ant products
many hardships can be avoided. Many plants produce valuable juices,
gums, and resins, while others yield us valuable timber for building
and cabinet uses.

While it is impossible to even suggest the great variety of plants
found within the confines of the United States, the following books on
botany will be found helpful in each of the different sections for
which they are designed.

Bibliography

For the botany of the Northeastern United States use:

"New Manual of Botany," 7th ed. Asa Gray.

"Illustrated Flora of the United States and Canada." N. L. Britton and
Hon. Addison Brown.

For the botany of the Southern United States use:

"Flora of the Southern United States." A. W. Chapman.

"Southern Wild Flowers and Trees." Alice Lounsberry.

For the Botany of the Rocky Mountain region use:

"New Manual of Botany of the Central Rocky Mountains." John M.
Coulter; Revised by Aven Nelson.

"Rocky Mountain Wild Flower Studies." Burton O. Longyear.

"The Trees of California." Willis Linn Jepson.

For general information regarding the shrubby plants of the United
States use:

"Our Shrubs of the United States." Austin C. Apgar.

"Our Northern Shrubs." Harriet Louise Keeler.

For the wild flowers outside of those already mentioned for the
Southern United States and the Rocky Mountain region use:

"Our Garden Flowers." Harriet Louise Keeler.

"How to Know the Wild Flowers." Frances Theodora Parsons.

"Field Book of American Wild Flowers." F. Schuyler Mathews.

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For the ferns and grasses it will be found worth while to consult:

"How to Know the Ferns." Frances Theodora Parsons.

"The Fern Collector's Guide." Willard Nelson Clute.

"New England Ferns and Their Common Allies." Helen Eastman.

"The Grasses, Sedges, and Rushes of the North United States." Edward
Knobel.

For the study of the monarchs of our forests the following books will
all be found exceedingly useful:

"Manual of the Trees of North America." Charles Sprague Sargent.

"Trees of the Northern United States." Austin C. Apgar.

"Handbook of the Trees of the Northern United States and Canada."
Romeyn Beck Hough.

"North American Trees." N. L. Britton.

"Familiar Trees and Their Leaves." 1911. F. Schuyler Mathews.

Besides these, several states have issued through their state
experiment stations bulletins dealing with the local plant
inhabitants. In some instances these publications cover forest tre