SCIENTIFIC COMMITTEE. 
xxxi 
Galls on Cabbage. — Mr. W. C. Worsdell, F.L.S., showed a cabbage 
having a gall on the stem caused by Ceutorhynchus sulcicollis. 
Diseased Orchids. — Mr. C. J. Lucas sent several orchids showing 
curious mottling of leaves, &c, which were referred to Wisley for 
further examination. (No fungus was found upon these leaves.) 
Scientific Committee, March 27, 1917. 
Mr. E. A. Bowles, M.A., F.L.S., F.E.S., in the Chair, and six members 
present. 
Two-flowered Snowdrop. — Mr. Bowles showed, on behalf of Mr. 
Elwes, a two-flowered plant of a seedling of Galanthus Elwesii. It 
had the usual two foliage leaves from the soil, but the flowering stem 
bore a third leaf, about three inches above the soil level, with a slight 
swelling at the base, and having in its axil a second flower. The axis 
of the bulb had apparently elongated and carried the flowering stem 
up above ground. 
Alnus glutinosa. — Mr. J. Fraser, F.L.S., showed a series of seedlings 
of the common Alder [Alnus glutinosa), which he had found growing 
near the Thames and in other places. He drew attention to the 
nodules on their roots, which, he pointed out, were inhabited by 
organisms, which, according to Hiltner, enabled the Alder to obtain 
nitrogen from the air much in the same way as does Pseudomonas 
radicicola in the case of leguminous plants. 
Crocuses. — Mr. Bowles showed a series of Crocus flowers, including 
various forms of C. chrysanthus of different shades of sulphur and 
yellow, forms apparently of C. biflorus, some of which were of blue 
shades and intergrading into chrysanthus ; C. Balansae with mahogany- 
coloured outer segments ; a seedling of C. minimus, with much larger 
flowers than usual, and with more substance ; very small forms 
apparently of C. vernus collected in Montenegro, and perhaps connected 
with Maw's curious plant from that district ; seedlings of C. Sieberi 
versicolor and crosses between that and the type C. veluchensis from 
Greece ; a curious form between C. Tommassinianus and C. banaticus ; 
and others. ^ 
Double-spathed Richardia. — Mr. H. W. Ratcliff sent a double- 
spathed Richardia africana, with slight green markings on the second, 
lower spathe. This development is not very uncommon in this and 
other species of Richardia. 
Gall-like Growths in Prunus Pseudocerasus. — Mr. R. I. Lynch, 
V.M.H., sent shoots of this rare tree from Cambridge Botanic Garden, 
showing groups of adventitious buds on swollen places on the shoots ; 
the tree was otherwise healthy, and it was suggested that the probable 
cause of the growth was damage by sparrows to the bud at the end 
of a shoot, and the subsequent development of buds present in the 
axils of the scale leaves. 
