xxxii PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 



surfaces of the leaves received the spray ; or the hedge might be fumigated 

 with hydrocyanic acid gas if some means of enclosing it could be devised. 



Yucca and Agave Disease. — Mr. Gussow reported that he had 

 examined the leaves of yucca and agave shown at the last meeting by 

 Mr. Saunders, and found they were attacked by the fungus Coniothyrium 

 concentr icnm, a common fungus in America, and previously recorded in 

 this country. He recommended that to stop its spread the leaves should 

 be dipped in a one per cent, solution of copper sulphate. 



Journal and Scientific Papers. — After some discussion initiated by 

 Mr. Elwes, Mr. Wilks moved and Mr. Holmes seconded : — 



" That the Scientific Committee would be greatly pleased if it would 

 be possible for the Council to publish annually a volume equivalent to 

 one part of the Journal containing only papers of definite scientific value. 

 They consider that the writers of really scientific papers are unwilling to 

 come forward when they know their productions will be mixed up with 

 ordinary horticultural matters, but they believe if they were issued 

 separately scientific men would willingly come forward." But the matter 

 was adjourned to the next meeting. 



Scientific Committee, April 14, 1908. 



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

 members present. 



Funnel-shaped Outgrowth in Ivy. — Mr. Worsdell, F.L.S., showed 

 a leaf of ivy having a funnel-shaped growth proceeding from near the 

 base, similar to that often seen in cabbages, but in this case it grew from 

 the lower surface. 



Boublc-spathcd Richardia. — G. Siggs, Esq., F.R.H.S., of Streatham 

 Hill, sent an inflorescence of Richardia ethiopica with a second full-sized 

 leaf proceeding from the flowering stem, about 8 inches below the normal 

 spathe, of a white colour, except at the tip. The phenomenon is common, 

 but was particularly well marked in this specimen. 



Potato-disease Fungi. — Mr. Massee, V.M.H., showed specimens of 

 potato tubers affected with " winter rot," with the fungus Ncctria Solani, 

 which is the cause of the disease, growing thereon, remarking that it had 

 been particularly prevalent during the past season ; a fact that he attri- 

 buted partly to the prevalence of rain during the last summer and the 

 difficulty of thoroughly drying the tubers before they were stored. This 

 fungus had recently, he said, been described under another name by an 

 investigator ; a condition of things found not alone in this disease, for 

 recently the fungus long ago described by Berkeley (see " Journ. Roy. 

 Hort. Soc." vol. i. 1H46, p. 33, figs. 30, 31) under the name of Tubercinia 

 scabies, and now known as Sorosporium scabies Fisch., one of the causes 

 of potato scab, had been apparently rediscovered and renamed as new, 

 Sjxmgospora Solani on the Continent, and this name had been taken up by 

 some botanists in England and Ireland as the newly discovered cause of 

 potato scab. 



