clxviii PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 
Scientific Committee, November 7. 
Dr. M. T. Masters, F.R.S., in the Chair, and seven members present. ■ 
Effects of Fog. — Mr. Wright sent some Vine leaves from Chiswick 
to show the injurious effects of the recent fogs in the gardens of the 
Royal Horticultural Society. All Grapes of the Muscat class were by 
far the most severely injured, the foliage being scorched, and the fruit 
more or less covered with a deposit. It was observv^d that the fog 
occurred remarkably early in the season. Prof. Church noticed that it 
was peculiarly pungent, causing in one instance a hundred buds of a 
Camellia to fall in a single day. Injury was also done to Orchids at 
Chelsea and Gunnersbury. The real cause of the injuries is the presence 
of sulphurous acid and the mechanical accumulation of sooty matter. 
Amaryllis Reversion. — Rev. W. Wilks brought an Amaryllis, the 
flowers of which apparently had more or less reverted to the primitive 
form of Hippeastrum, from which the modern types have descended 
through hybridisation. 
Foxglove, Hybrid. — A flowering spike of a hybrid between a white- 
flowered Foxglove and Digitalis lutea was sent by Dr. Wilson, of St. 
Andrews University. It was remarkable in having much smaller flowers 
than those of the usual form of D. jnujmrea x D. lutea ; and though 
possessing perfect pistils, there were no stamens. Moreover, the flowers 
were white, but slightly virescent. Tne white Foxglove was the pollen 
parent. 
French Vineyanh injured. — Dr. Masters observed that having lately 
seen the vineyards of the Champagne country, also those near Neuchatel 
and the Lake of Geneva, he did not observe a single perfect bunch of 
Grapes. They appeared to have rotted through frosts prevailing at the 
time fertilisation was taking place. 
Pimis aristata. — He also exhibited cones of this rare Californian 
Pine. They are remarkable for bearing a needle-like spine at the back 
of the thickened end of scales, the so-called apophysis. It was a question 
whether this be not a variety of P. Balfouriana, which grows in the 
same country and only differs in the smaller spines. It is a good maritime 
species, bearing dense foliage. They were received from Mr. Croucher, 
of Crief. 
Peloriau Mentha.— 'Pvofessov Henslow showed a drawing of a regular 
flower of Mentha rotundifolia found wild by the river Wye, near Ross. 
Scientific Committee, November 21. 
Mr. Michael in the Chair, and four members present. 
Hiioyeastrum Species. — With regard to the specimen exhibited by 
Mr. Wilks at the last meeting, supposed to be a reversion from the 
florists' " Amaryllis," which was derived by hybridisations on species of 
Hippeastrum, it appears to be very close to H. stylosum (Bot. Mag., 2278), 
introduced m 1822. It differs, however, in having white streaks instead 
of green on the perianth, and the stamens and style are shorter. The 
