Hv PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



Scientific Committee, November 19, 1918. 



Mr. E. A. Bowles, M.A., V.M.H., in the Chair, and three members present. 



Iris leaves attacked by Dipteron. — Mr. J. Fraser showed some flies hatched 

 out from leaves of Iris foetidissima burrowed in the same fashion as those shown 

 by Mr. Bowles last year. Mr. Bowles said that several species of Iris with 

 evergreen leaves were being attacked and disfigured in his garden. The fly 

 hatches out some time between March and July, the earlier date being given 

 by Professor F. V. Theobald, and the later being the one which Mr. Fraser had 

 observed. It pupates in late autumn in the leaves. Two species have been 

 associated with this trouble, but Mr. Collin of the Pathological Laboratory, 

 Kew, considers they may be merely two names for the same thing, Agromyza 

 iraeos. 



Sensitiveness of potato plants to exposure. — Mr. F. J. Chittenden referred to 

 the extraordinary sensitiveness of potato plants to full exposure or to less exposure 

 to light, Sec, as revealed by the weights obtained from plants in different positions 

 in the experimental plots at Wisley, a fuller account of which is published else- 

 where (see p. 72). 



Scientific Committee, December 3, 191 8. 



Mr. E. A. Bowles, M.A., V.M.H., in the Chair, and five members present. 



Seedlings of Ceratonia. — Mr. J. Fraser, F.L.S., showed seeds and seedlings 

 of Ceratonia Siliqua which he had found on Kew Green. The seedlings have 

 hypogeal cotyledons. 



