ty DISTRICT OF CANTERBURY. 403" aS thoe ae| black, as if the smoke from a furnace had > Majo |‘ fallen upon them: the half matured hops and it; ei ih| changing to hard knobs, or berries. This ch, in y effect, however, was no more, perhaps, than en in i sate ,: a natural consequence of the aphides.* Ines: ie kd = This being as it may, it is a fact which } a° “aN ought not to be left unnoticed, here, that ly y et the foul lands, which have been mentioned, were, generally speaking, the only ones one of| that escaped the mischief! This I find par- oe|; be is hee| ticularly noted, in my Journal, in six diffe- ligh-| rent places, as the facts occurred, in walking. 2 ly on:_ over the grounds. In one instance, the in- ultivae| tured|* Philosophers and Naturalists differ in their opinions, son of respecting the CAUSE of the BLIGHT Or MILDEW. One is of opinion(see Dr. Forpycer’s Elements of Agri- APHIS,§ : culture, Ed. 1796, p. 111.) that it proceeds from a weak vested state of the plant; whose juices are thereby converted inning into sugar, which allures insects. Another, that the sac-

h occ charine mucus, which is palpable on the surface of plants, is the feces of the aphides which feed on them,

know Both positions may be well grounded: the saccharizing the ex:| process, in the one case, taking place within the plant, ps sil in the other, within the animal. Mr. Currts, I be- pai lieve, may claim the discovery, respecting the aphis:

| and the appearance of the hops, under notice, was simi-

lar to that of a sallow, which I saw in Mr. Curtis’s aN by GARDEN, near Brompton; and which owed its sooty ap- omnis pearance, pretty evidently, to aphides.

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