XXXvi PROCEEDINGS OF THE ROYAL HORTICULTURAL SOCIETY. 
Red Currant, and rarely, in this country, on the Gooseberry. It has 
occurred on the Gooseberry at Oxford. 
Potato Spraying. — Some discussion took place with regard to the 
relative values of Bordeaux and Burgundy mixtures for spraying 
Potatos. In the former quick-lime is required, in the latter washing- 
soda ; usually washing-soda is of more constant composition than 
quick-lime, and the spray is therefore easier to make. In both cases 
the more dilute the two materials to be mixed before the mixture is 
made the better, and in both cases also the mixing should be done 
immediately before the spray is used. The experimental spraying 
in Ireland during the past few years, as well as other experiments, 
shows that the I per cent. Burgundy mixture is an excellent and safe 
preventive of the disease caused by Phytophthora infestans. The 
proportions of the materials used are 4 lb. copper sulphate, 5 lb. 
washing-soda, and 40 gallons of water. 
Various Plants. — Mr. Bowles showed, on behalf of Mr. Elwes, 
Orchis foliosa, a fine-flowered form of 0. latifolia, 0. incarnata, Arisaema 
concinna (from Himalaya and the Tibet border), a smaller 9- plant 
of a species of Arisaema, Polygonatum with a foliaceous inflorescence 
which is constantly produced, and Roscoea (Cautleya) lutea, a hardy 
plant from the Himalaya belonging to the Scitamineae. He also 
showed from Miss Willmott's garden at Warley the uncommon Iris 
Sintenisii from Asia Minor ; from his own at Waltham Cross 
Meconopsis latifolia, the semi-double form ; blue and white forms of 
Campanula patula, and a form with six petals ; a pale-blue form of 
Ranunculus, and the uncommon Centranthus angustifolius, which he 
had collected at Lautaret. 
Hybrid Mints. — Mr. J. Fraser, F.L.S., showed a hybrid of Mentha 
rotundifolia X viridis which had been collected near Swanage ; it was 
nearer to rotundifolia than to its other parent. 
Hail : Effect on Onions. — Mr. Fraser also drew attention to the 
effect of hail upon Onions, the leaves of which show white bruises 
caused by recent hailstorms. 
Xyleborus dispar in Sycamore. — Mr. Cheal sent specimens of the 
common Sycamore, Acer Pseudoplatanus, from the Crawley district, 
bored by the shot-hole borer, Xyleborus dispar, and containing the 
larvae of the beetle in great numbers. This pest also attacks fruit- 
trees, including Plums, Pears, and Apples, and is a difficult one to 
deal with, the complete destruction of infested trees being probably 
the best course to pursue. 
Effect of Salt Water. — Dr. Voelcker sent a note upon a case of 
scorching of Peaches and Vines, where, the supply from a well having 
given out, water from a lake had been used ; the analysis of the lake 
water showed no less than 162 J grains of salts to the gallon, magnesia 
being present also, and suggested the infiltration of sea water. The 
well water contained only 8 grains of salts to the gallon. 
Populus lasiocarpa. — Mr. J. C. Allgrove showed a fruiting specimen 
of this fine tree from Langley. 
