SCIENTIFIC COMMITTEE. 
cxxxvii 
Thorn Apples. — Miss E. A. Portal sent two Thorn Apples, i.e., 
apples in which the petals and stamens appear to have been 
transformed into sepals with fleshy bases exactly like those which 
constitute the apple fruit below ; these bases are spirally arranged ; 
the whole fruit is roughly four-lobed and seedless. 
Plum-tree affected with Silver-leaf . — Mr. L. M. Cooper, of Goring-on- 
Thames, sent a portion of a plum-tree badly affected with silver-leaf 
disease and also having on the leaves a brown fungus. It was sug- 
gested that the plant had been starved, and that better feeding and 
some lime should be given the tree. 
Enations on leave's of Aristolochia Sipho.< — Miss K. Ashley, of 
Crouch End, sent a leaf of Aristolochia Sipho bearing enations of various 
sizes on the lower surface ; these enations, unlike those observed on 
the leaves of most other plants, did not seem to be along the main veins 
but across the smaller vein branches. 
Walnut diseased. — From Petworth Park Gardens came twigs of a 
walnut with both fruit and foliage attacked by the fungus Marssonia 
Juglandis, which Klebahn has shown to be the conidial stage of Gno- 
monia leptostyla. It is rare for the fruit to be attacked. 
Scientific Committee, September 26, 1916. 
Mr. E. A. Bowles, M.A., F.L.S., F.E.S., in the Chair, and six members 
present. 
Polyporus betulinus.- — Mr. J. Fraser, F.L.S., showed a large speci- 
men of Polyporus betulinus from a birch tree, measuring 8| in. in 
diameter. 
Lobed-leaved Pear. — He also showed three-lobed leaves of pear 
from a shoot springing from a cut-back branch, and a twin fruit of 
Victoria Plum with two separate stones. 
Proliferation in Dianthus barbatus. — Mr. W. C. Worsdell, F.L.S., 
showed a curious case of proliferation in the Sweet William from Mr. 
Miller Christy's garden, in which, after flowering, shoots had developed 
from the bracts just below the flower. 
Carpellody of anthers in Papaver orientate. — Mr. E. A. Bowles 
showed an example of Papaver orientate from Mr. Sidney Morris's 
garden in which a very large number of the stamens had become 
transformed into carpels and were tightly packed around the ovary. 
He also showed, from the same garden, shoots of seedlings from Labur- 
num Vossii, in which the leaves had a remarkably curled appearance, 
due to the failure of the midrib to elongate normally, while the lamina 
had developed to the usual extent. 
Peronospora grisea on Veronica Hulkeana.- — Mr. Bowles also showed, 
from the same source, shoots of Veronica Hulkeana attacked by Perono- 
spora grisea, a fungus common on wild Veronicas in this country. 
Spraying with Bordeaux mixture or Burgundy mixture would 
