86 



gauden management. 



I 



3= 



suffer more tlian others. The branches most affected having consumed the 

 sap inherent in them, can draw no further supply, and on the first day -when 

 the solar influence is sufficient to cause perspiration, they languish and die. 

 The cause of the injury is not always apparent at the time ; but in a ratio 

 proportionate to its extent, it will show itself in a year or two." In this 

 manner Mr. Bailey accounts for the paralysis which so frequently overtakes 

 this highly esteemed fruit— first a branch, then a whole side dying away, in 

 the fine sunny days of spring, to the surprise of the gardener ; the Moorpark 

 variety being especially subject to such sudden mortality. 



205. The walls Mr. IM'Intosh has erected at Dalkeith Palace are twelve feet 

 high and eighteen inches thick. A rubble-stone con- 

 crete foundation rises to within six inches of the surface, 

 over which are laid nine courses of brick in bed on the 

 wall side. The tenth course on each side has headers 



laid across, meeting in the middle every ^ ^ 



three feet, as binders to the wall, having a 

 whole brick laid over them. The bottom 

 of the vacant space is occupied by the water- 

 pipes. The same is carried on upwards, 

 only changing the place of the headers, so 

 that they shall not be immediately above 

 each other; the last three courses being 

 solid. This wall gives equal heat on both =--a^5^s= 

 sides, and in place of headers hoop iron may be employed as binders. When 

 one side only is to be heated, a brick and a half, or fourteen inches, will 

 occupy one side, and brick in bed the other. 

 206. Mr. Walker recommends a mode of heating by hot air, the apparatus 



being a furnace, placed below the 

 ground-level of the wall, and as 

 much as practicable at the lowest 

 point. The fui-nace is bricked in, 

 so that the coal may coke, both 

 for economy of fuel and labour. 

 The air in contact with the plates 

 h c, being expanded by heat, wilJ 

 flow into the hot-air chamber/, 

 coming in contact with the colder 

 air there. Here it acquires a ro- 

 tatory motion, retaining a ten- 

 dency to ascend in the ratio of 

 its rai-efaction, flowing along tho 

 flues h, in the direction of tho 

 arrows, into the flues h h, through 

 the narrow opening left. The 

 sliding of the doors t will acco- 



