340 London Nurseries. 



upwards of 500 ft. in length, and heated a great part of them with hot water, 

 from his own plan, and with no other assistant than his own carpenter 

 and smith. Having fallen into the common error of fixing an insufficient 

 number of pipes for meeting the demands of very severe weather, to remedy 

 the error (which he is not the only nurseryman who has committed) he 

 has placed a small steam boiler by the side of his water boiler, and con- 

 ducted steam pipes from it in the centre of his water pipes. These steam 

 pipes are not quite an inch in diameter, but they are effectual in heating 

 the water at a distance of nearly 200 ft. from the boiler, and we have little 

 doubt they would effect the same object upwards of .500 ft. distant. The 

 pipe, if we are not mistaken, returns to the boiler, into which the con- 

 densed water is pushed forwards by the steam. By this arrangement the 

 smallest possible quantity of water and steam is lost; only care must be 

 taken, by air or water valves, to provide against a vacuum. We do not, how- 

 ever, recommend this plan for imitation, as we consider it too intricate, but 

 to show how errors may be corrected, or difficulties overcome, by an in- 

 genious persevering man. 



Kpsom Nursery, May 19. — New or rare plants which have flowered 

 during the months of March and April : — 



i?anunculus (C. Bank.) frigidus Willd. 



Magnolia {L.) Soulangc«H(7 Sweet's Brit. Fl. Gard. 260. 



^'rabis (Z<.) rosea Dec, arenosa Scojj. 



/beris {L) Lagasca?2a Dec. 



Sterigma tomentosum Dec, B. F. G. 278. 



Moricandja arvensis Dec. 



Schizopetalum Walkeri Sims, Bot. Mag. 2579. 



Fiola (Town.) palniata L. v. bicolor variegata Fisch., pubescens Ji^. Brit. 

 Fl. G. 223. 



O'xalis {L.) Deppii Link and Otto. 



Hovea (R. Br.) purpiirea Siveefs Fl. Ausi. 13. 



Kennedya coccinea Vent. Swt^s. Fl. Aitst. 2.?. 



Z/upinus [Tourn.) canaliculatus Sweet's B. F. G. 283. 



Claytonia (L.) grandiflora Siveefs B. F.G. 216. v. pallida, caroliniana 

 Mich. B. F.G. 208. 



Ribes (L.) sanguineum. 



Pknax trifolia L. Bot. Mag. 1334. 



Borkhausifl (Bohm.) purpurea Spi-eng. 



Andr6med« (L.) iuxifolia Lam. Bot. Mag. 2660. 



iShododendron ( L.) arboreum Sm. v. roseum, phoenfceum, Smithidnum, 

 sinense Sweet. 



Polemonium (!>.) Richardsoni Graham, Bot. Mag. 2800. 



Witheringia (Herit.) montana Dun. 



Pedicularis canadensis L. B.F. G. 37. 



Calceolaria C-L.) thyrsiflora Graham, purpurea Graham., connata Hook. 

 Bot. Mag. 2876. 



Terbena {L.) Melindris Gillies, Bot. Reg. 1184., pulchella Sweet's B. F. 

 G. 295. 



Cyclamen (Z/.) repandum Sib. and Sm. B. F. G. 117. 



JVarcissus {L.) albus Haw. Bot. Mag. 1300., Macleaii Lindl. Bot. Mag. 

 2588 , sexlobatus Haw., montanus Ker, Bot. Reg. 123., pulchdilus Haw. 



A'ci* {Salisb. and Sweet) trichophylla Sweet in Obs. B. i^-G. 297., grandi- 

 flora Sweet in Obs. B. F. G. 292. 



Trillium sdssile L. Bot. Mag. 40. cernuum L. Bot. Mag. 954. 



(Scilla (L.) pumila Brot. — Alpha. 



