Ixxxiv PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Scientific Committee. September 12, 1905. 

 Mr. G. Massee, V.M.H., in the Chair, and five members present. 



Abies amabilis, diseased. — Mr. Bartlett, of Pencarrow Gardens, Corn- 

 wall, sent specimens and a photograph of this tree badly affected by Chermes 

 abietis. There is no effectual remedy, as spraying is practically useless. 



Potatoes, diseased. — Mr. G. S. Saunlers, sent some tubers, received 

 from allotment gardens near Liverpool, badly attacked by CEdomyces 

 leproid.es. As each tuber contains a mass of spores which are readily 

 disseminated, the tubers should be burnt, and no potat ^es again planted 

 on the same soil. • 



Apple, variety. — Dr. Bona via forwarded some remarkably dark 

 crimson-coloured apples. They were borne by a double-flowering tree, 

 and had the strange name Pyrus Xiedzwetzkyana, B.M. :. 7975. 



Liliacece, diseased. — Mr. Giissow showed microscopic specimens of 

 Botrytis cinerea, which he had found attacking the lily of the valley, 

 white lily [Lilium candid km Solomon's seal, tulips and snowdrops. 

 The fungus appeared to be identically the same on each plant, not having 

 developed any "biological forms." 



Vic la, sp. c ~a :-s : :.;o/o: — Mr. Worsiey showed pods from species of 

 violets. Prof. Henslow observed that it is suggested that as the flowering 

 season declines, and the foliage is developed in the violets, flowers are 

 produced on the runners, but they bear no corollas. In warmer regions, 

 as Liguria, violets bear no deist, gamous buds, while the conspicuous 

 flowers are fertile, whereas these latter are barren in England. Hence 

 the presence of the cleistogamous buds appears to be a matter of com- 

 pensation. (Henslow, " Origin of Floral Structures." pp. 257, 258.) 



Orchids. — Mr. Odell showed sprays of two fine orchids, one from 

 South Africa, Satyrium carneum; the other from North India, Antho- 

 gonium gracile. 



Scientific Committee, September 26, 1905. 

 Mr. G. Massee, V.M.H., in the Chair, and seven members present. 



Galls on Willow -leaves. — Mr. Holmes, F.L.S., sent some willow- 

 leaves from Yeovil having galls upon them. Mr. Saunders, F.L.S., 

 reported : u These galls are formed by the grub of a sawfly, Nematus 

 gaUicola. It is a very common insect, and makes galls on leaves of 

 various kinds of willow, Salix fragilis, Caprea, cinerea, and alba being 

 the species it mostly infests. The insect pupates in the ground. One 

 point of interest about this gall is that it is of equal size on either side of 

 the leaf, whereas most galls on leaves are formed almost entirely on one 

 surface." 



Cherry Sawfly. — Mr. Saunders reported as follows upon this pest sent 

 from Bournemouth : " The insects attacking the cherry-leaves are the 

 grubs of the ; cherry or pear sawfly ' (Eriocampa limacina). The grubs 

 are commonly known by the name of cherry or pear slugworms, according 

 to the tree they are found on. When the grubs have attained their full 



