Queries and Answers. 



617 



if a dry heat only is wanted, the water must be drawn off from the boxes. 

 q is one of the lights ; r, end view of the pit ; s, air stick, or tilt ; t, place to 

 hold coals under ground, with hatchway to let them down ; «, place to 

 receive the ashes; v, key to turn the cocks. 



I beg to observe, that I have no doubt but die same fire would heat the 

 pits if built to 100 ft. in length, or placed in another row. The apparatus 

 was erected by Messrs. H. and D. Grainge of Uxbridge, whose attention 



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and workmanship are highly satisfactory. T am, Sir, &c. — John Cameron. 

 Woburn House Gardens, Bucks, June 18. 



Canker in Peach Trees. — Sir, The extent of the kitchen-garden at this 

 place is about an acre within the walls, which are entirely of brick. The 

 east, south, and west walls are 12 ft. high; the wall on the north side 

 is 13 ft. high, and 300 ft. long, with a border on the south side of it 18 ft. 

 wide. It is not more than twenty-eight years since this wall was built 

 and the border made; and it has been appropriated to the growth of 

 peaches and nectarines from that time to the present : but, unfortunately, 

 peach and nectarine trees cannot be kept in existence against this wall 

 more than five or six years. No trees can thrive better, or show a more 

 healthful appearance, than the trees do on this wall for the first three or 

 four years after being put in: but at the end of that time, all the lower 

 branches of the trees are affected by the gum and canker, which soon 

 destroy them ; the remaining part of the tree begins to bear evident marks 

 of weakness and decay ; and this weakness and decay is succeeded in the 

 following spring by swarms of the green fly, and a still farther increase of 

 the gum and canker, which, for the most part, terminate in the destruction 

 of the trees, or in rendering them worthless. These mortifying circum- 

 stances always take place at the time the trees are just arriving at a good 

 bearing state. 



With respect to the border, it has been made and remade twice over ; 

 the last time, it was renewed under the direction of the late Mr. Lee, of the 

 Vineyard, Hammersmith, who also pointed out the spot where the best soil 

 was to be taken from to renew the border ; but, after all, the trees have 

 failed twice since, it being supposed that the roots perished after getting 

 out of the good upper soil into the sour clay. The border is at present 

 about 3 ft. 6 in. deep, to all appearance of as good soil as is to be got any 

 where near this place ; the bottom or subsoil of the border is a stiff sour 



