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THE POPULAR SCIENCE MONTHLY.

my first impressions have been fully confirmed. In every variety of situation and circumstances the white petunias have been neglected for the colored, in exact proportion to the intensity and vividness of color; and the same I found to be true, in a less degree, as regards the deep and pale morning-glories. I have called the attention of others to the facts, and proved that the preference of the insects is determined by color alone. If there was any difference whatever in sweetness or fragrance, it was in favor of the rejected white flowers.

Yours respectfully,

 Thomas D. Lilly.⁠ Kent's Store, Fluvanna County, Va. ${\displaystyle {\begin{matrix}{\big \}}\end{matrix}}}$ October 23, 1878.⁠

AN AMERICAN HAIRY TORTOISE.

To the Editors of the Popular Science Monthly.

Noticing your interesting extract, from "Land and Water," concerning the hairy tortoise, I take the liberty of mentioning a similar species found, to my knowledge, in the lakes of this valley. Its description tallies almost exactly with that of the Chinese variety, except perhaps in size. It is about three inches in length by two and a half in breadth, is very closely covered by its shell; the calipee is not hinged, and out of some dozen specimens examined by me not one was without the coat of water-grass. Its habitat is the bottom of shallow lakes and ponds, and near the submerged roots of trees, where it is often caught with the hook. It has a remarkably fetid odor. The grassy or confervoid covering is not of any very great length, generally about one half or three fourths of an inch. It is, I believe, an undescribed species, though Mr. Agassiz may have had a specimen among his collection of tortoises from the Mississippi Valley.

Very respectfully,

 J. F. Battaile.⁠ ⁠Yazoo City, Mississippi, December 8, 1878.

EDITOR'S TABLE.