Agriculture. 3 75 



idoes not thrive at a greater height than that of 3200 feet 

 .above ilie level of the sea. Barley and oats, however, grajsr 

 at the height of from 1500 to 1800 feet, but only in vailevs^ 

 At the ht-ight of from 1200 to 1300 feet the night frosts 

 are very prejudicial to the seed. 



Mr. Wolf has found near Turneau in Bohemia a pecu- 

 liar mass of glass produced from a blackish ba^altes, v hicJi 

 is met with in abundance at Buchbeig in Bohemia, Whep. 

 this rijtone is placed in a glass furnace^ it iuses in eight 

 hours so that boxes aijd other articles can be made of it, 

 and of any forni; at pleasure. It is more fusible than gla»s, 

 and therefore cannot be blown like glass, but can be draw.u 

 out into coarse threads and rods. When cold it is harder 

 than glass, and is more difficult to be ground and to be 

 cut. When cast it adheres strongly to iron moulds ; and 

 on this account moulds of brass must be employed. It cor- 

 rodes the crucible also much less than glass ; but this stone 

 may be used instead of manganese, as an addition to glassj 

 V'hich it purities in a similar manner, 



SIK, AGRICULTURE, 



Tu yovir 66th number of the Philosophical Magazine 

 there is an extract of Mr. Close's communication to the 

 Board of Agriculture, in which he says, " the eighth part 

 of an acre of good turnips steamed, and with the liquor 

 mixed with oat straw cut, will keep a full grown beast ia 

 good order six months. An acre of turnips with the firsi 

 crop of hav, will fatten two bullocks in the ^ame time^ 

 &c., &c." ' 



I understand by this that one acre of steamed turnips will, 

 with oat straw mixed in the liquor, keep eight full groww 

 beasts in good order six months. 



I wi>li to know w hat quantity will make the same num- 

 ber of fjjll grown beasts fat f 



There appears to me some ambiguity in the above, as also 

 in what follows, namelv, that four acres, with the addition 

 of unc^fourth of an acre of turnips, will keep onli/ three 

 beasts, and fatten two bullocks. It appears to me that by 

 the first part, if steam was used, a great many more ought 

 to be kept. 



I also could wish to have the proper method of steaming 

 detailed, with the quantity of turnips so given each animal 

 each day ; also the quantity of oat sjtraw ; also the expense 

 of the steaming. 



Your entering into this minutely would render an im» 

 portant service to the coimtry in general, and I for one 

 would thank vou particularly. 

 '1\> Mr. TdUh. X. Y. 



