Transactions of the Horticultural Society. 243 



the quince, yielded at the rate of 15'1 to 1 ; the Brown Beurree, 

 4*4 to 1 ; the Crassane, 8"2 to 1 ; and the Colmar, 2-8 

 to 1 ; together averaging above 7*6 in favour of the quince 

 stocks. Such a result deserves the attention of nurserymen 

 and the owners of small gardens. It is to be regretted that 

 the trial was not made from trees of the same age and condi- 

 tion ; those on quince stocks being from maiden trees planted 

 in 1818 — 20, and those on free stocks from very old 

 trees, cut down in the same years, but which had quite re- 

 covered their luxuriance and fruitfulness. To this paper a 

 note is prefixed by Alexander Seton, Esq. F.H.S., with a 

 view to call the attention of persons to the same object, 

 stating, that he thinks pears grafted on quince stocks, are 

 better adapted for stiff clayey or loamy soils than those on 

 free stocks, and recommending this choice to planters located 

 on such soils. 



3. Description, toitk Plans, of a Hot- Wall. By Mr. John Hay, 



C.M.H.S. Read November 21. 1826. 



No man has had more experience as a designer of horti- 

 cultural buildings, nor is any one a better judge of what is 

 necessary either for the forcing, or the simple protection, of 

 plants, than Mr. Hay. Every thing of the kind coming from 

 him is, therefore, deserving attention. He had noticed, in 

 his early practice, that hot-walls were generally overheated 

 opposite the first turn of the flue, and not heated enough at a 

 distance from the fire. This circumstance urged him to in- 

 vent some plan of equalising the heat over the whole face of 

 the wall, so that no part should be warmer or colder than 

 necessary. This is accomplished by having a hollow in the 

 interior of the wall, serving as a general heat-chamber for dif- 

 fusing and retaining warm air, and also smoke-flues for con- 

 veying heat throughout. The description is accompanied by 

 a plan, which gives a perfect idea of the structure. 



4. Report upon the New or Rare Plants, 'which Jlouered in the Gar- 

 den of the Horticultural Society, at Chiswick, between March 1825 

 and March' 1^26. Part II. Hardy Plants. By Mr. John 

 Lindley, F.L.S. &c. Assistant Secretary. Read September 4. 

 and 18. 1827. 



Trees or Shrubs. — i?osa Dicksonz. Mr. Lindley says, " it 

 is scarcely credible, that in our own country there should 

 exist a species, which even the most sceptical of those who 

 have studied the genus are ready to admit as a distinct form." 

 Yet such is the fact. It was sent to the Society in 1824, by 



R 2 



