Clxxvi PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 
some remarkable leaves of the Sweet Chestnut, consisting of but little 
more than the^midribs, which had issued from the stump of a tree which 
had been cut down. He observed that the narrow-leaved variety grown 
in parks probably originated in this way. 
Proliferous Apple- shoot. — Dr. Masters also exhibited a specimen of 
this well-known phenomenon, in which the leafy shoot appeared to pene- 
trate right through the centre of the Apple and then proceed to a length 
of upwards of a foot beyond it. It is due to the floral bud being replaced 
by a leaf bud within the "pseudo-fruit," the Apple being really of the 
nature of a stem in which the pistil is embedded. 
Leaf -cutter Bees' Nest. — Specimens of these cells made of portions 
of leaves were sent by Mr. Thos. Crosswell, Homewood, Eden Park, 
Beckenham. He describes the formation of these leaf-cells as follows : 
" After our Freesias had finished flowering and died down, the sticks that 
had been used for their support around the sides of the pots were 
removed, to facilitate their being placed on a shelf in the full sun. The 
bees took possession of the holes left by the removal of the sticks, and 
on turning out the pots of bulbs in August many of these cells were 
found." 
Scientific Committee, November 20, 1900. 
A. D. Michael, Esq,, F.L.S., in the Chair, and five members present. 
Oak-leaves. — Rev. W. Wilks showed additional specimens illustrating 
the great diversity in the lobing of the leaves. One specimen was pec- 
tinate, and without examination could hardly be distinguished from a 
frond of Blechnum Spicant. 
Dimorphic Orchid. — Mr. Harry J. Veitch showed a spike bearing 
flowers like those of Odontoglossum crispum on the upper half of the 
spike, and blooms of 0. Wilckeanum below. The specimen came from 
Mrs. Briggs-Bury, Bank House, Accrington. The inference is that the 
two-fold character may be due to the dissociation of hybrid characters. 
The plant was referred by Mr. Rolfe to Odontoglossum DenisoiKE. 
Diseased Peas from Broughty Ferry. — Dr. William Smith reported 
that " the specimens sent were attacked by the Pea-mildew, which 
showed as a white mould on all parts ; later, after the material dried up, 
numerous black winter-fruits of the Erysiphese group of fungi confirmed 
the earlier observations. The species is probably Erysiphe Martii, Lev., 
although an almost similar species is also said to attack Peas. In the 
summer of 1899 I found the same disease, accompanied by the same 
fungus, on garden Peas in the Lothians, near Edinburgh. Flowers-of- 
sulphur, thoroughly dusted on with a sulphur puff or bellows, would 
check it. Spraying with Bordeaux Mixture will be more effective, but 
the low value of the crop raises the question whether it would pay to 
spray the plants several times each season." 
It was stated that in some districts the cultivation of late varieties of 
Peas was given up owing to the excessive prevalence of mildew. 
Fruits of Pyrus japo7iica. — Mr. Divers brought from the Duke of 
Rutland's gardens at Belvoir fruits of this species. Mr. Hudson 
