,
Fourth Street, New York City.

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I would like to exchange some revenue stamps for postage stamps.
Among those I wish to exchange are two varieties of one-dollar
stamps and a forty-cent stamp.

LEONARD T. BEECHER,
Wellsville, Alleghany County, New York.

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I take YOUNG PEOPLE, and I think it is splendid.

I have a great many French, Italian, English, and German postage
stamps which I would like to exchange for others.

GEORGE B. DONNELLY,
P. O. Box 4574, New York City.

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I am collecting postage stamps, and would like to exchange.
Correspondents will please state the number of stamps in their
collection, and send me their list. I have twelve hundred stamps,
and I am thirteen years old. I would like to know the age of my
correspondents.

CHARLES S. PETRASCH,
13 West Thirty-second Street, New York City.

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I would like to exchange postmarks with any boy readers of YOUNG
PEOPLE in the West. I am twelve years old.

ARTHUR S. MOORE,
40 Third Place, Brooklyn, New York.

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I would like to exchange postage stamps with any correspondent.

R. L. PRESTON,
P. O. Box 327, Lynchburg, Virginia.

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LOUISE.--Your question, "Is the mosquito of any use in the great economy
of nature?" has often been asked by many older and wiser than you, for
it is not generally known that in their larval state mosquitoes form an
important branch of nature's army of tiny scavengers. The larvae live in
the water of stagnant pools and marshes, and feed upon particles of
decaying matter, and as their number is so very large, the amount they
devour is considerable. By thus purifying the water they destroy the
miasma which would otherwise arise and pollute the atmosphere to such an
extent that no human being could breathe it with safety. The value of
the work accomplished in tropical countries by these tiny scavengers is
very great. It is estimated that the air of certain marshy regions would
be so poisonous that no animal higher than a reptile could breathe it
and live, were their purifying influence removed. We do not know that
mosquitoes in the winged state have any useful mission beyond that of
depositi