xxxviii 
ROYAL HORTICULTURAL SOCIETY. 
Yerdier, Perfection de Lyn, Souvenir de M. Poiteau, Nardy 
Preres, and Thyra Hansmerich. 
Prizes also were offered for Pucbsiaa and Palms. 
SCIENTIFIC COMMITTEE. 
Major Trevor Clarke, in the Chair. 
Dr. Grilbert reported, on the manua-like substance from the 
leaves and shoots of Peach-trees in the orchard-house and glass 
wall at Kew, that 
" The white exuded matter was flaky and semitransparent. A 
small portion, heated on platinum over a spirit-lamp, gave the 
odour of a burning fat. It was scarcely at all affected by either 
water or alcohol, but readily dissolved in ether. It was there- 
fore a solid fat of some kind ; but the quantity at command was 
too small to determine more respecting it." 
The Secretary produced radical shoots from the stock of a 
Pear-tree from Dr. Thomson's garden at Kew, some of the leaves 
of which were three-lobed. It was stated that, in some Indian 
species of the genus, leaves were constantly produced of this 
character. 
Mr. Berkeley stated that he had ascertained that the warts 
which are so common on pear-leaves are produced by a little 
Acaroid closely related to those which affect the buds of hazels 
and black-currants. 
Mr. Wilson Saunders exhibited specimens of Fapaver nudi- 
caule, in which the stamens were partially changed into carpels. 
Dr. Masters stated that the common officinal poppy is sometimes 
similarly affected. 
The Dioscorea exhibited at the last Meeting by Messrs. Veitch 
proved to be a new species, of which Dr. Masters promised a 
description and figure. 
The Chairman produced vine-lpaves in which there was a de- 
ficiency of chlorophyl, supposed to arise from an insufficiency 
of nutriment. 
A discussion took place with reference to what species of grass 
had resisted best the unusual drought. Mr. Wilson Saunders 
spoke highly of a species of Bromus from California. Dr. Gil- 
bert stated that at Kothampstead (where the root-development. 
