CHAPTER XI. 
SHELTER-BELTS. 
Vegetable Need of Protection Illustrated. — Observed Fallacies and 
Reasonable Contradictions.—Laws of Heat Radiation Demonstrated. 
—Nightly Atmospheric Heating.—Condition and Elevation of Air 
Favorable to Vegetable Life.— Atmospheric Vapor, How Supplied. 
—The Benefits of Transpiration of Forests. — Observations in 
Europe, and What they Prove.—A Conclusion Established.—Ad- 
duced Facts.—Motion of the Atmosphere.—Liquid and Aerial Mo- 
tion Contrasted. — Aerial Motion Illustrated. — Protective Systems 
and their Controlling Influences.—Experienced Facts versus Theo- 
ry.—A Study for the Orchardist and Farmer.—Experienced Testi- 
mony on the Influence of Shelter-Belts. . 
Tue following article from the pen of Professor Gale 
speaks for itself, and I need make no apology for insert- 
ing it here. 
“Both animal and vegetable life need protection. 
Nor do we all see eye to eye in regard to the the- 
ory of protection. This is well illustrated in the fol- 
lowing statement from a late number of the Scientific 
American: ‘A well-grown evergreen-tree gives off 
continually an exodium of warmth and moisture that 
reaches a distance of its area in height; when the tree- 
planters advocate shelter-belts surrounding a tract of 
fifty or more acres, when the influence of such belt can 
only reach the height of the trees of such belt, they do 
that which will prove of little value.” There are two 
fallacies here. First, that the climatic influence of a tree 
arises from its power to send off an ‘ exodium of warmth’ 
into the surrounding atmosphere. In relation to this 
we will only ask how many Christmas-trees will be re- 
quired to keep our parlor warm next winter? The sec- 
