CCXXviii PKOCEEDINGS OF THE EOYAL HOKTICULTUKAL SOCIETY. 



with whitish spots on lower half. Tubers, white, with large lenticels 

 like S. Commersonii. A comparison of the hybrids with their parents 

 shows that the hybrids have the form of stem, the form and colour of 

 foliage, and the habit and general appearance of S. Commersonii. The 

 calyx is generally that of S. Commersonii. The flower in form and 

 colour is that of S. tuberosum, the shade only different [No. 202, 4 and 3J. 

 The berry is intermediate, shaped like that of S. Commersonii, but blunter 

 and thicker, and spotted like that of S. tuberosum. 



The cross above described is particularly interesting, in view of the 

 fact that very rarely has Solatium Commersonii been got to produce fertile 

 seed. Mr. A. W. Sutton, V.M.H., has obtained some, but, besides this, 

 no one appears to have done so, although the plant has been widely 

 grown. The Committee, on the motion of Mr. A. W. Sutton, unani- 

 mously recommended the award of a Silver Knightian Medal to Mr. Paton 

 for his interesting exhibit. 



Potato tubers. — Mr. A. W. Sutton showed a series of tubers of 

 various Solanums as follows : — 1, Solanum Commersonii (white-flowered 

 form) ; 2, (seedling from No. 1), Solanum Commersonii (white-flowered), 

 selfed 1906. These tubers showed a distinct break from those of the 

 parent, the skin being of a different colour and the tubers of a different 

 shape. 3, Solanum Commersonii, Fitzherbert's form ; 4, Solanum 

 Commersonii (violet-flowered form) ; 5, (seedling from No. 4), Solanum 

 Commersonii (violet-flowered) selfed ; 6, Solanum Ohrendii ; 7, Solanum 

 Maglia ; 8, Solanum Maglia x commercial Potato ; 9, (seedling from 

 No. 8), Solanum Maglia hybrid x commercial Potato, selfed ; 10, Solanum 

 etuberosum. 



Virescence in Crepis virens. — Mr. Holmes, F.L.S., showed a plant 

 of Crepis virens in which the individual flowers had become stalked, 

 and in place of a pappus a calyx had developed. The capitulum looked 

 very like the inflorescence of an umbelliferous plant. 



The colonization of a river bank. — Mr. Fraser, F.L.S., made some 

 remarks concerning the colonization of the bank of the Eiver Thames. 

 A piece of the bank had fallen away, and this year upon the newly- 

 bared earth the following plants had appeared. The first two are 

 exceedingly uncommon colonists of such places. Platanus acerifolia, 

 or London Plane ; Coronilla varia ; seedling of Salix alba, S. fragilis, 

 S. Caprea, S. cinerea, S. viminalis ; Alnus glutinosa ; Badicula (Nas- 

 turtium) amphibium, B. sylvestre, B. palustre ; Melilotus officinalis, 

 M. indica ; Solanum Dulcamara, S. nigrum ; Mentha aquatica, M. sub- 

 glabra, M. arvensis ; Polygonum Convolvulus, P. Persicaria, Parietaria 

 officinalis ; Angelica sylvestris, Lycopus europaeus, Sambucus nigra, 

 Senecio aquations, Scrophularia aquatica, Oenanthe crocata, Lythrum 

 Salicaria, Veronica Anagallis and Barb area vulgaris. 



Salix lanata. — Mr. Fraser recounted how he had discovered this rare 

 alpine willow, and showed specimens. The plant does not appear to 

 thrive in many gardens, but there are fine specimens in the garden of 

 the Society at Wisley, and in the Botanic Gardens at Birmingham. 



Pruning after planting. — A communication dealing with the question 

 of the wisdom of pruning immediately after planting trees was received from 

 Mr. J. Landsell and is printed at p. 384. 



