The gardener at Cambridge could not inform Dr. Gorman how long the insects had been there, or from whence they came, but they went there by the appellation of “amelca bug.”  The gardener found these insects very destructive to plants upon which they fostered, and although he tried every means short of injuring the plants to remove them, he found it impossible, as they adhere to the leaves and parts of the stem with such tenacity, and are so prolific, that the young ones are often found spreading themselves over the neighbouring plants.  On this account, it would be worth while to attempt the cultivation of the prickly pear in the open air in this country, and place the insects upon them, for in all probability the insects would, by good management, do well.

[1] It is computed that there have been imported into Europe no less a
    quantity than 880,000 lbs. weight of cochineal in one year!

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Fossil Turtle.

The remains of a sea turtle have lately been discovered, and are now in the possession of Mr. Deck, of Cambridge.  It is imbedded in a mass of septaria, weighing upwards of 150 pounds, with two fine specimens of fossil wood; and was obtained in digging for cement stone, about five miles from Harwich, in three fathoms water, where, as a mass of stone, it had been used for some time as a stepping block.—­Bakewell’s Geology.

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Geological Changes.

The following are the writers whose opinions have obtained the greatest celebrity, as advocates for particular systems accounting for the formation and subsequent alteration of the earth:—­

Mr. Whitehurst taught that the concentric arrangement of the crust of the globe was destroyed by the expansive force of subterranean fire.

Burnet’s theory supposes this crust to have been broken for the production of the deluge.

Leibnitz and Buffon believed the earth to have been liquefied by fire; in fact, that it is an extinguished sun or vitrified globe, whose surface has been operated upon by a deluge.  The latter assumes that the earth was 75,000 years in cooling to its present temperature, and that, in 98,000 years more, productive nature must be finally extinguished.

Woodward considered there was a temporary dissolution of the elements of the globe, during which period the extraneous fossils became incorporated with the general mass.

De Luc, Dolomieu, and, finally Baron Cuvier, unite in the opinion, that the phenomena exhibited by the earth, particularly the alternate deposits of terrestrial and marine productions, can only be satisfactorily accounted for by a series of revolutions similar to the deluge.

Among the singular views entertained by men of genius, in the infancy of the science, are those of Whiston, “who fancied that the earth was created from the atmosphere of one comet, and deluged by the tail of another;” and that, for their sins, the antediluvian population were drowned; “except the fishes, whose passions were less violent.”