CCXii l?R0CE]3t)lNGS OF THE HOYAL HORTICULTURAL SOCIETY. 



SCIENTIFIC COMMITTEE. 



Septembeb 12, 1911. 



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



present. 



Bulhophylluni orthoglossum. — Mr. O'Brien, V.M.H., drew atten- 

 tion to this uncommon species, figured in the Gardeners' Chronicle, 

 June 20, 1908, p. 406, shown by Sir Jeremiah Colman, Bart., which 

 had been imported from the Phihppine Islands. 



Gall on Tanacetum, dc. — Mr. J. Fraser, F.L.S., showed specimens 

 of a gall on Tanacetum vulgare formed by the fly Hormomyia tanace- 

 ficoia, both on the stem and in the leaf axils. It had been collected 

 on the Thames bank near Eichmond. He also showed the fasciated 

 stem of a vegetable marrow which showed about forty ridges. Mr. 

 Fraser remarked concerning the perpetuation of abnormalities that 

 many appeared to depend upon merely local conditions, and could not 

 be perpetuated, e.g. although he made cuttings from the abnormal stem 

 of the mint he showed last year (Jouenal E.H.S., xxxvi. (1910), 

 p. cxviii) with leaves displaced and showing other abnormalities, they 

 had reproduced the normal type entirely this season. 



Quince with felted growth. — Mr. Fraser also showed a quince 

 covered with hairy growth, somewhat similar to that seen on the 

 young fruits, but here persisting to a late period, without any obvious 

 cause. 



Oats and Barley shooting after harvest. — Mrs. E. Eobinson sent 

 specimens of oats and barley making a second growth after the har- 

 vest had been cut. The growth sprung from the base of the main 

 stem, and bore flowers at the height of about a foot. They were 

 collected at Limavady, Co. Derry. 



Scientific Committee, September 26, 1911. I 



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



members present. 



Oxalis Ortgiesii. — Mr. Odell showed a well-grown specimen of 



this Peruvian species from a cool house at Stanniore in a very flori- | 

 ferous condition. See Garlenfiora (1875), t. 817. 



Diseased plants. — Dr. Yoelcker, M.A., showed specimens of celery : 



attacked by the fungus Septoria petroselini var. apii. This disease j 



appears to be becoming increasingly prevalent each year, and, as | 



pointed out earlier in the year in the minutes of this Committee (p. xxxi. i 



see also p. 115) a considerable number of samples of " seed ■ 

 of celery were attacked. Probably spraying with Bordeaux mixture or 



