clxx PE0CEEDIXG8 OF THE ROYAL HORTICULTURAL SOCIETY. 
and a Hydnum amongst the Hymenomycete fungi, and probably some 
bacteria. 
" Prevention. — No form of spray or wash is Ukely to give permanent 
results. Trees badly cankered should be removed and burnt as soon as 
possible. Where practicable, the canker may be cut out, care being 
taken to cut well into the healthy parts around ; the wound thus produced 
should be carefully painted over with tar. This must be done in autumn 
or winter, otherwise the tar will not sink in. Wounds made in pruning, 
lopping, or otherwise should be tarred. If the orchard is liable to 
canker, it is safest to tar even small pruning cuts." 
Apple Stocks with Caterpillars. — Mr. Ballard, of Colwall, sent some 
tops of a Lord Suffield stock perforated. They had been attacked by 
the caterpillar of the ''wood-leopard " moth Zeuzera u^sculi, some being 
still within it. A woodpecker had subsequently further injured the 
shoots by trying lo extract the grubs. The best remedy is to insert a 
stiff wire, and so extract, or kill them in situ. 
Nests of the Bose-leaf-cutter Bee. — Mrs. Biggs, of Leyton, contributed 
a large section of a decayed Poplar, perforated by the borings of a 
caterpillar. These were now occupied by the nests of this species of bee, 
Megachile centuncularis. 
Fog Deposit on Glass. — Mr. Hudson sent a sheet of glass from a 
conservatory to show the large amount of deposit upon it after the late 
destructive fog described at the last meeting. 
Scientific Committee, December 5, 1899. 
Dr. M. T. Masters, F.R.S., in the Chair, and four members present. 
Chinese Cabbage. — Dr. Masters gave some account of this species, 
Brassica chinensis, which is cultivated in China and also in the tropics, 
where the Common Cabbage does not succeed. It has a taller stem, but 
does not appear to form so sound a "heart " as in our Cabbages. It is 
the custom to protect the heads in pits, frequently turning them over ; 
they thus provide an excellent supply for winter use. The communication 
was received from Mr. Carles, Consul at Tientsin. [Seed of this 
Cabbage was sown in March, but it all ran up and blossomed before 
June. — Editor.] 
Ghermes Fagi. — This destructive but too common pest of Beech-trees 
was received, with inquiries as to the best means of destroying or 
preventing it. If the trees are but slightly attacked, spraying with 
petroleum and soapsuds in water should be persevered with, repeating the 
process from time to time. If, however, the trees are too badly attacked, 
nothing but cutting them down, and burning at least the bark, can 
prevent it spreading to other trees. 
