SCIENTIFIC COMMITTEE, OCTOBER ig. 



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with potassium sulphide from early stages in the plant's growth 

 onwards would keep the disease in check. Dr. Voelcker also showed 

 cabbage leaves badly attacked by the fungus Phyllosticta hrassicae, 

 causing spotting of the leaves so as to render the plants useless. 



RernarkaUe fruiting of Citrus trifoliata, syn. jEgle sepiaria. — Mr. 

 Bowles showed branches of Citrus trifoliata { = Mgle sepiaria) fruiting 

 remarkably abundantly. In most seasons in his garden the earliest 

 flowers^ are staminate, foUow^ed a little later by some pistillate ones, 

 some of w^hich produce fruits, and the crop is a small one. This 

 season, however, most of the flowers produced at the second flowering, 

 were hermaphrodite and practically all produced fruits. 



Witches' Broom on Scots Fir. — A remarkable witches' broom on 

 Scots Fir was sent by 0. W. Eicketts, Esq., of Fouhs Court, Eastleigh. 

 It was a dense growth about 12 inches in diameter. The growth v/as 

 probably due in the first place to the attack on the tree of a species 

 of Mcidium, and it had continued for several years, the leaves on the 

 attacked portion being smaller in size than those on the normal 

 shoots. 



Biihus innominatus, S. Moore. — Some fruiting shoots of this 

 newly introduced Ruhus, from China, were shown by the Hon. 

 Vicary Gibbs, under the name of Ruhus Kiintzeanus. The fruits 

 are insipid, small, and amber and black in colour. See Gardeners' 

 Chronicle, October 21, 1905, p. 290, where it is shown that R. inno- 

 minatus and R. Kiintzeanus are synonymous. 



Scientific Committee, October 10, 1911. 



Mr. J. T. Bennett -PoE, M.A., V.M.H., in the Chair, and six 

 members present. 



Variation in Elm. — Mr. Worsdell, F.L.S., drew attention to the 

 variation which had occurred this year, both at Kew and at Cambridge, 

 in the foliage of Ulmus glabra, Miller. At the base of many leaf-blades, 

 from one to three extra small leaflets had developed on the petiole. 

 These, when on the side of the leaf in which the blade is usually less 

 well developed, appeared to be complementary growths, but in several 

 of the leaves the blade was symmetrical. A second variation, of 

 considerable frequency, was seen in the forking of the midribs of the 

 leaves, sometimes to the base, so as to produce apparently two leaves 

 at a node, sometimes less deeply. In some few cases also some of the 

 leaves formed ascidia. 



Rudbeckia triloba malformed. — Mr. Worsdell also exhibited an 

 inflorescence of Rudbeckia triloba, with foliage leaves developing from 

 the apex, through the centre of the capitulum. 



Menthol plant. — Mr. Holmes, F.L.S., showed a specimen of the 

 true M'enthol plant from his garden. The plant was derived from one 

 growing in Berlin. It is a form of Mentha arvensis called piperascens, 

 and is a native of Japan. 



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