Memoirs of the Caledonian Horticultural Society. 305 



duce the most luxuriant wood." This is agreeable to the 

 experience of Menteath, and to the law of nature as to the 

 shooting of ligneous plants, (p. 245.) 



" As to what is called dressing the stools, I have every 

 reason to think it is quite useless ; it is no doubt meant to 

 prevent that part from rotting, which it will not do. In 

 general, the part of the stool near the surface, or what is 

 above ground, will decay long before next cutting, although, 

 in some very few cases, where it is left high, and the shoots 

 spring from the top, it may in some measure be preserved, 

 although in an unsound state ; but I by no means think it a 

 disadvantage for that part of the stool that is above ground 

 to rot soon, as in that case the new shoots will be sure to 

 eome from the roots." 



Oak Mr. Hosie considers by far the best tree for hedge-rows ; 

 and the best effect, and at the same time the least injury to the 

 hedge and the corn crops, is produced by planting them irre- 

 gularly. When planted regularly, they have a tendency to 

 stagnate the air. Oak plants for a- young hedge should be 

 3 ft. high or so, and planted along with it ; for an old hedge, 

 6 or 7 ft. in height ; so that their tops may be beyond the reach 

 of cattle. 



8. Account of an improved mode of ventilating Hot-houses. By 

 Mr. John Tweedie, Gardener at Eglinton Castle. 



Instead of giving air at the top of the roof by letting down 

 sliding sashes, Mr. Tweedie raises up by a sympathetic move- 

 ment two or three panes in a small tin frame, which he calls a 

 hatch. 



In the longitudinal section of a roof ventilated in this way 

 {Jig. 108.), the ventilators (k) are shown in a half open state, 



and the cord, rod, or jack line (e), to which the lever (h) is 

 attached, is shown balanced at one end by a weight (g), and 

 fastened at the other by a movable hand-pin (b). In one of 

 the upright styles or door-posts (a), in the end of the house, 

 are pierced several sockets .at 6 in. distance. " Into these 

 sockets, an iron hand-pin (b) is introduced, regulating the 

 Vol. III. — No. 11. x 



