lly in cleanliness in the mushroom cellar, and
ascribes his best successes to his most thorough cleaning. Every summer
he cleans out his cellars and limewashes all over.

=Mr. Van Siclen's Method.=--Mr. Abram Van Siclen, of Jamaica, L. I.,
also grows mushrooms very extensively in underground cellars, whose
arrangements do not differ materially from those of Mr. Denton's, except
in his manner of heating. He runs an immense greenhouse
vegetable-growing establishment, as well as a summer truck farm, and
uses hot water heating apparatus, also smoke flues as employed
ordinarily in greenhouses, especially lettuce houses. The sheet iron
pipes, except in squash houses, he does not hold in much favor.

[Illustration: FIG. 3. CROSS-SECTION OF THE DOSORIS MUSHROOM CELLAR.]

=The Dosoris Mushroom Cellar.=--This is a subterranean tunnel or cellar
that was excavated and arched some ten years ago, expressly for the
cultivation of mushrooms. It is situated in an open, sunny part of the
garden, and its extreme length from outside of end walls is eighty-three
feet; but of this space nine feet at either end are given up to
entrance pits and a heating apparatus; and the full length of the
mushroom cellar proper inside the inner walls is sixty-three feet. The
walls and arch are of brick, and the top of the arch is two and one-half
feet below the surface of the soil. This tunnel or arch is seven feet
high in the middle and eight feet wide within, but a raised
two-feet-wide pathway along the middle lessens the height to six and
one-half feet. Between this pathway and the sides of the building there
is only an earthen floor, but it is quite dry, as the cellar is
perfectly drained. Three ventilators sixteen feet apart had been built
in the top of the arch, but this was a mistake, as the condensation in
the cellar in winter from these ventilators always keeps the place under
them cold and wet and rather unproductive. One tall wooden chimney-like
shaft would have been a better ventilator than the three ventilating
holes now there, which are covered over with an iron and glass grating.

[Illustration: FIG. 4. GROUND PLAN OF THE DOSORIS CELLAR.]

At one end of the house and behind the stairs descending into the pit is
the heating apparatus, from which a four-inch hot-water pipe passes
around inside the house near the wall and only four inches above ground.
A three-feet wide hemlock flooring for the bed to rest on is laid along
each side and abo