tat a

to the Firft Volume.

585 of iron crow, with a wooden handle acrofs at the top, and made thick and tapering, in order to remove the earth fufficiently for the infertion of the ends of the poles.

Hop-Dog.—This is. akind of lever, made of a long piece of good wood, with a fixed fulcrum, to the lower end of which is fattened a{trong piece of iron with teeth, which grafp the lower end of the hop-pole firmly, and by the action of the lever wrenches up the pole,

To be read after Line 10, under the Head Chaft-Cutters, Page 32.—A wheel with two knives fixed on its radii will, however, it is believed, cut more ftraw in a given time, and with a given force, than a wheel with three knives; as where there are three knives one of them is always upon the ftraw; the refiftance is, of courfe, fo great and confiant, as materially to diminith both velocity confequently power. Mr. Burrel, of Thetford, in Norfolk, we believe, has at- tached to the fide of thefe machines a crank, which, by means of a{pindle termi- nating in a:cog-wheel, much affitts the primary force. Two boys, or women, are capable of turning this wheel for many hours together. It is probable that the ap-

plication of a multiplying wheel to thefe machines would much facilitate the labour of them.

and momentum, and

Lo be read after Line 1s, Page 52.---It is alfo of importance that ftables fhould be better lighted than they ufually are; the blindnefs fo frequent among horfes has been attributed with confiderable plaufibility to an exceffive’ fti- mulus of light on their coming out of a dark ftable, where the irritability of the or- gans of fight has been for hours accumulating, into the full glare of day. Farm ftables, during the fummer feafon, are very generally expofed to the open air;‘the door or wicket is feldom fhut but at night: In confequence of this expofure, flies, which are attraGted by the horfe-dung,&c. have free accefs. It will generally be ob- ferved, however, that, in fuch expofed fiables, cobwebs alfo are very numerous: it is unwife to difturb them; the fpider fhould be cherifhed, as he faves the horfe from the irritation of many troublefome enemies.‘The provifion is natural, and fhould be attended to.

Lo be read after Line 4, Page 67.—On the mode of applying fuel in the firft inftance, and fteam in the fecond, to culinary proceffes, both on a large and {mall feale, Count Rumford’s Philofophical Effays may be confulted with much ad. vantage.

To be read after Line 18, Page 75-—The: price of brick-burning in Nor- * AD 2