SCIENTIFIC COMMITTEE. 
cxxxv 
or liver of sulphur (potassium sulphide), one ounce to three gallons of 
water, or, if the weather is hot and sunny, one ounce to four gallons of 
water, would help to keep the disease under control. Neither of these 
sprays must be applied strong, as the result would be leaf-scorching. 
For gumming and die-back there is no known remedy. The only 
thing is to cut away badly gummed portions of the tree and cover the 
cut with some common knotting. Clean and healthy conditions, with 
well-drained soil, all help to keep the plants free of gumming." 
Pear foliage diseased. — Mr. J. Knight, of Verwood, Dorset, sent 
some spotted leaves of Pears ' Chaumontel ' and ' Doyenne de Cornice,' 
and of the Apples ' Red Victoria,' ' Peasgood's Nonsuch,' and ' Gas- 
coygne's Scarlet.' Miss Cayley wrote : " The leaves were rather too 
dry and disorganized to enable me to give a very satisfactory report, 
but to judge from general appearances and the presence of a consider- 
able amount of Fusicladium dendriticum (on the apple leaves) and 
Fusicladium pyrinum on the pear leaves and twigs, I should say that 
the principal cause of trouble is these fungi. There are some ex- 
crescences on the under-side of the pear leaves, probably due to the 
pear -mite, Eriophyes pyri, which has bored under the epidermis, but 
I think the general condition of the leaves is not due to this pest. 
Spraying with Bordeaux mixture before the blossoms open and twice 
after the blossom has set, at intervals of about fourteen to twenty-one 
days, is generally recommended. Keeping the stems and branches 
clean with winter washes is also advisable." 
Cattleya guttata, albino form. — Mr. Gurney Wilson exhibited an 
albino form (the first ever obtained) of Cattleya guttata var. Sander ae* 
exhibited by Messrs. Sander, St. Albans. The sepals and petals are 
greenish yellow and the labellum white. It was sent up from the 
Orchid Committee to have a Botanical Certificate confirmed. Mr. 
Gurney Wilson moved and Mr. W. C. Worsdell seconded that a 
Botanical Certificate be given ; this was carried by six to one. 
Various Plants. —Mr. H. J. Elwes exhibited the following plants 
in flower, with the notes attached ',—Hedychium elegans ellipticum 
and Rhyncanthus longiflorus, grown in greenhouse, but might be hardy 
in the south-west of England ; Dioscorea pulchella, a climbing yam 
from Sikkim with ornamental pendent racemes, which might be 
hardy in the south ; Hymenocallis guianensis, a tropical species, very 
dwarf and fragrant, with deciduous foliage quite distinct from the 
nearly hardy H. Harrisiana, which it resembles ; Allium Wallichii 
var. from Tibet, much more robust and twice as tall, but of the 
same colour and habit as the Himalayan species introduced by Capt. 
Bailey ; Amphicome arguta, quite hardy at Colesborne, an ornamental 
procumbent plant which does not start growth till June ; Phlomis 
sp. from Kashmir, 5 ft. high ; Poterium hakusanense, from Japan, 
seems identical with P. obtusum ; Zephyranthes Candida var. major, 
from Uruguay, much finer but more tender than the type ; Lonicera 
species, or var. of common Honeysuckle, very late and distinct from 
any other I know, a hardy climber ; Astragalus stipulatus, from Sikkim, 
