L. 46 per annum, deducting the sinking of L.ioo addi- 

 tional expence, in the erection of the machine; and Mr 

 Wilson of Simprin in Berwickshire, is of opinion, that 

 wherever a great quantity of wheat is grown, the resis- 

 tance is so great, and 10 overcome it is so ruinous to 

 horses, that a threshing mill ought to be driven either 

 by wind or water. 



Others object to wind-machines, on account of the ex- 

 pence of the erection, the uncertainty of their going in 

 calm weather, and the danger attending them when the 

 wind blows hard. Mr Brodie of Garwald, in particular, 

 observes, that in hilly situations, the wind is apt to rise 

 in such sudden squalls, as frequently to make that power 

 inconvenient, and not unaccompanied by danger. 



Mr Neil of Kelso informs me, that the expence of & 

 good wind threshing mill will be about L. 550, and that 

 when a horse power is annexed to it, the additional ex- 

 pence, according to the present price of timber, will be 

 about L. no more, or L. 670 in all. 



4. Aware of these objections to the power of wind 

 alone, Mr Kennie of Fantassie, Mr Broun of Markle, 

 and other respectable farmers, have erected threshing, 

 machines, so constructed, as to be worked either ly wind 

 or by Worses, as may be found necessary. They consider 

 the power of wind to be so uncertain, that without the 

 addition of horses, a great inconvenience would often be 

 sustained. Mr Hume of East Barns has a machine of 

 the same description, but owing to the vicinity of the 

 sea, he has hardly ever had occasion for the horse 

 power. He considers threshing-machines of great ad- 

 vantage, even with horses ; but when wind or water can 

 be obtained, it is worth, he states, on a farm of about 

 250 Scotch acres of arable land, from L. loc to L. ZOQ 

 fer annum. 



