SCIENTIFIC COMMITTEE, MARCH 10. XXxiM 



Dr. Miiller observed that it attacks the very youngest plants 

 when only three or four leaves are present, and especially D. 

 glacialis. 



Peach Tree Gumming. — Mr. S. T. Wright sent a piece of a 

 trunk badly gummed from Chiswick, saying that it appeared to 

 have some grubs upon it, but none could be seen. It was for- 

 warded to Mr. McLachlan for further investigation. Mr. Douglas 

 observed that when gumming first appears, trenching all round 

 the roots, with the insertion of fresh loam, checks it at once, but 

 if it has reached an advanced stage, as in the specimen sent, the 

 tree must be removed. 



Pinus Coulteri {macro carp a). — Dr. Masters exhibited some 

 handsome cones and foliage of this tree grown at Lord Ducie's 

 grounds, Tortworth, Gloucestershire. It is also quite hardy in 

 Kent. He observed that it was hardier than P. insignis, though 

 it comes from a lower altitude than the former in California. 

 P. Coulteri differs from the variety macrocarpa in having curved 

 spines. 



Orchids Monstrous. — Dr. Von Miiller sent specimens, draw- 

 ings of which were shown by Dr. Masters, of flowers of Glossodia 

 and Caleana, the former having three lips, while the latter had 

 no lip but a petaloid column, &c. 



Scientific Committee, Maech 10, 1896. 



E. McLachlan, Esq., F.E.S., in the Chair, and four members 



present. 



A further specimen of a diseased trunk of a Peach tree was 

 sent from Chiswick. The bark was covered with exudations of 

 gum, and spotted all over with the expelled excreta of a small 

 caterpillar, which was found burrowing under the bark, and pene- 

 trating only a very short distance into the wood. The insect was 

 found to be the larva of Semasia Woberana, the Apple or 

 Pear tree Bark Moth. It was suggested that a plaster of clay 

 mixed with paraffin, and applied to the trunk of the trees, might 

 prove a remedy, or rather a prevention. As the insect never 

 penetrates to any great depth, it was thought that the trees 

 would survive many years, even when seriously affected. 



