SCIENTIFIC COMMITTEE, JANUAKY 17. 



XXV 



Scientific Committee, Januaby 17, 1911. 



Mr. E. A. Bo^YLES, M.A., F.L.S., F.E.S., in the Chair, and 

 elev'en members present. 



Sap exudation in Elm trees. — Mr. J. Eraser, F.L.S., showed a 

 piece of the \)ark of an Elm tree perfectly white, part of a strip extend- 

 ing down the trunk of a tree from a small wound some distance up. 

 He remarked that wounds in Elms may bleed for several years, as they 

 often take many years to heal. The white appearance of the strip was 

 due to the death of the green alga which covered the trunk elsewhere, 

 but which, where the sap flowed, had been destroyed. Mr. Eraser 

 thought that possibly the sap of the tree itself had had an injurious 

 effect upon the alga. 



Azalea gall. — A galled growth from Azalea indica came from 

 Cheltenham. The whole of the leaves at the tip of a shoot had become 

 greatly and uniformly thickened, and were covered with a whitish 

 bloom." These galls are due to the attack of the fungus Exo- 

 hasidium ja'ponicum. (See Journ. E.H.S. xxxiv., p. 45.) The only 

 remedy is to pick off the galled growths and burn them. 



Coloration of Bean seeds. — Mr. Chittenden showed a series of seeds 

 of Erench Bean grown at Wisley in the past summer from seed shown 

 before the Committee last January, when the earlier history was given. 

 (See JouRN. E.H.S. xxxvi., p. xxv.) The parent seed was the i-esult of 

 an accidental cross in 1907, and the progeny had segregated in 1909. 

 The seeds sown and the seeds produced in 1910 were as follow : — 



(a) Parent seeds black : Plant 1 produced 28 black seeds ; 25 partly 

 chocolate, partly black ; 35 brownish black. Plant 2 produced 52 seeds 

 like parent. Plant 3 produced 285 seeds like parent. Plant 4 pro- 

 duced 46 seeds brownish black. 



ih) Parent seeds creamy-white : Plant 1 produced 170 seeds pur- 

 plish-tinted white, with mottling and spots and streaks of black, 

 55 black or reddish-black with small spots of purplish- white. Plant 2 

 produced 100 seeds flesh-white. Plant 3 produced 90 seeds creamy- 

 white, 5 flesh-white. 



(c) Parent seeds tan : Plant 1 produced 25 seeds chamois. Plant 2 

 produced 22 seeds dead-leaf brown with tiny spots of flesh-white ; 32 a 

 little lighter than foregoing with large number of spots and blotches of 

 flesh-white, the blotches speckled with ground colour; 7 brownish 

 terra-cotta with tiny spots of flesh- white; 35 terra-cotta with spots and 

 blotches of flesh-white speckled with terra-cotta. Plant 3 produced 

 72 seeds chamois to dark hazel. Plant 4 produced 115 seeds chamois, 

 more or less mottled with black. 



{d) Parent seeds maroon : Plant 1 produced 135 seeds bistre to dark 

 tan. Plant 2 produced 25 seeds purple-black to buff. Plant 3 pro- 

 duced 33 seeds dark steel-blue to lighter purplish-blue. Plant 4 pro- 

 duced 195 seeds purple-black to snuff colour. Plant 5 produced 135 

 seeds like Plant 2. 



