436 DOUBLE POTS. 



afford a longer succession of produce, owing to the succession 

 of young shoots which are caused to spring from its larger 

 branches and steins ; and, in all cases when trees can be made to 

 retain their health in exposed pots, the 

 period of the maturity of their fruit is 

 very considerably accelerated." (Hort 

 Trans., vii. 358.) This seems to have 

 led Mr. Eivers to his happy idea of 

 orchard-houses and miniature fruit-gar- 

 dens, now so much in request. 



The best method of counteracting the 

 Fig. xciv. injurious effects of exposure to the air 



is by employing double pots (Fig. XCIV.), as recommended in 

 the Gardeners' Magazine, ix. 576, and by Captain Mangles in 

 his Floral Calendar, p. 44 ; the space (6) between the two pots 

 being fiUed up with moss or any other substance retentive of 

 moisture. 



Tliere are two ingenious contrivances of tMs nature: one ty Mr. 

 Robert Brown, potter, at Ewell, and the' other by Mr. William 

 Eendle, the nurseryman at Plymouth. In both cases the object is 

 the same, namely, to have a double-sided pot in one piece. It is 

 obvious that by such contrivances, if the sides of a pot are left 

 empty, the stratum of air contained between them will prevent the 

 earth from becoming heated ; and if they are filled with water, the 

 inconvenience of over-watering, on the one hand, or over-drying, on 

 the other, will be prevented in summer, because water will be continu- 

 ally filtering slowly through the inside lining as the roots require it. 

 The latter reason renders them valuable for striking cuttings, and for 

 window gardens, where it is almost impossible to keep plants duly 

 supplied with moisture. Doubtless, in winter, if water be introduced 

 between the sides of this kind of pot, its inner surface will be always 

 wet ; the young roots will receive too much fluid, and the plant will 

 die : but if the empty space be permitted to remain empty, the inner 

 portion of the pot receiving moisture only from the watering required 

 for the weU-being of the plant, the outer side having water occasion- 

 ally poured on it, or the pot being immersed for a few minutes in it, 

 the sides of the pot will be kept so fuUy saturated, that they wiU. be 

 constantly giving out into the empty space a vapour, by which the 

 inner portion of the innermost pot (towards which the young roots 

 always inoUne, and with which they are in contact) wiU. be kept suffi- 

 ciently cool and moist, and the roots will be preserved from injury." 



