CCXxii PEOCEEDINGrS OF THE KOYAL HORTICULTUKAL SOCIETY. 



SCIENTIFIC COMMITTEE. 



Septembee 14, 1909. 

 Mr. A. W. Hill, M.A., F.L.S., in the Chair, and five members present. 



Prunus Chapronii. — Mr. Odell submitted the fruit and leaves of a 

 Prunus growing in a plantation at Henley. A comparison with the 

 description and plate of the "Bevue Horticole," 1881, p. 467, of Prunus 

 Chapronii, showed apparent agreement, except that the fruits of the 

 shown were a little smaller. Mr. Hill undertook to see whether he could 

 determine anything further regarding it from the Kew records. 



Oenothera sp., dx. — Mr. Fraser, F.L.S., showed a specimen of 

 Oenothera Lamarchiana in flower which he had found in his garden, 

 from self-sown seed. He took the form to be that of the primitive species 

 named Oe. rubrinervis by De Vries. Last year the veins of the leaves 

 were reddish, whilst this year they were almost white, due possibly to 

 the sunless season. The fruits, however, were streaked with red. 

 Mr. Fraser thought that this variety was taking the place of Oe. biennis 

 in Surrey both in the garden and in the wild state. 



He also showed a flesh-coloured specimen of Echium vulgare, col- 

 lected in 1901, still retaining the flesh colour, and sprigs of Calluna 

 vulgaris var. glabrescens, and Erica cinerea, gathered in Surrey, growing 

 on a chalk cliff at an elevation of 700 feet. The difficulty of growing 

 heaths and rhododendrons on chalky soils is generally known, and 

 Mr. Fraser was surprised to find the present specimens. The soil was 

 about 18 in. deep, with a further 6 in. of decayed chalk. As 5 in. of 

 soil would be a sufficient depth for the Ericas, it was thought possible 

 that the upper stratum was free from lime, and Dr. Voelcker undertook 

 to analyse a sample if sent to him. 



Diseased Pears. — Mr. Wigley, Whitehill, Gravesend, sent some Pears 

 attacked by the fungus Gloeosporium fructigenum. The trees should be 

 sprayed in winter with copper sulphate solution (1 lb. to 25 gallons of 

 water), and with Bordeaux mixture in summer. 



Lettuce dying. — Cos and Cabbage Lettuces, both young and old 

 plants, were received from Mr. Haskins, of Bournemouth, the leaves of 

 which were browned and decayed at the edges. Mr. Gordon, V.M.H., 

 said that he had experienced the same trouble, and he thought it was 

 due merely to the excessively wet season and cold weather, and was not 

 attributable to wrong treatment or disease. 



Scientific Committee, Septembee 28, 1909. 



Mr. E. A. Bowles, M.A., F.L.S., F.E.S., in the Chair, and eleven 

 members present. 



Prunus sp. — Mr. Hill, M.A., F.L.S., stated that the plant shown at 

 the last meeting under the name of Prunus Chapronii proved to be a 

 form of P. cerasifera. 



