i800.| Effects of Froft on Vezetation. 81

reit ſatisfied, this- ſpring, till they have, in a ſimilar manner, gone over the ſame land a ſecond time. This double hocing,‘indeed, muſt be attended- with confiderable expence,—probably with as mach as ten or twelve ſhillings per acre; and in return, perhaps, the farmer may receive little more than a bare equivalent in wheat for the money which he has thus, with ſome difficulty, ſpared to expend: But, I truſt, that he will, feelingly, confider the two- fold benefit which he will thus confer upon the public, by raiſing an extra quantity of grain, and at the ſame time, increaſing thac Kind of labour which poor females can jon in, and which they ſo much ftand in need of in the preſent ſeaſon. Can any thing be deviſed, more proper, profitable, or more truly charitable,‘than the general adoption of this ſimple piece of huſbandry?

In the deſcripton which I ſent you of the ſhew of fat cattle at the Smithfield- great market, I am told that T omitted to men- tion two prizes which were adjudged to his Grace the Duke of Bedford,‘one for the beſt fat heifer, the other for the beit fat wether, both fed on graſs and hay only. Though this was not a wilful omiſſion, I feel myſelf bdund to beg pardon of all whom 1t may coÑñcern.:

Iam, Sir, yours, PRACTICUS«

EEPECTS OF FROST ON VEGETATION. To the Editor of the Commercial and Agricultural Magazine. SIR» OOKING lately into a journal of remarkable phyſical phœnonena, which was, for many years, kept by my fa- ther; I was particularly entertained by the followins fats con- cerning the power of fro. If they can be, without impropriety, inſerted in your Masazine, I fhall, with great pleaſure, ſee them recorded in a Miſcellany fo truly reſpe&able, which will, indeed, be particularly endeared to mê by ſuch connexion, with the me- mory of the ingenious and excellent man by whom thoſe fas were obſerved.

By ſevere frôóſt, great elms ſuffer the leaſt of all our common trees, except thoſe of the pine and fir ſpecies. Oaks, eſpecially if ancient and full grown, are, very generally liable to be, by extreme intenſity of froſt, rifted. Limes, walnuts, afpes, beaches horn-beams; birches, cheſnuts, are not ſo readily injured. be rifts produced in trees by froſt, are again cloſed, upon a thaw, though with le(s of cohefive ſolidity, than they had beſore. The laurel ls apt to bediſcoloured by froft, and to ſuffer a mortification in lome of its branches. In a winter exçceſlively ſevere, hollics, if very old, or if recently clipped ia hedges, are ſubjed to be, more or leſs, withered, A land-tortoiſe is accuſtomed, in winter, to bury himſelf, deep, in-the earth; and, if in a winter of unuſual ſeverity, he. ſhgquld, by any accident, be bindered from penetrating to bis