SCIENTIFIC COMMITTEE. 
xxix 
appeared in some seedlings of his in 1909. The flowers were of various colours, 
many of them very rich, and of large size up to two inches in diameter. A 
Certificate of Appreciation, proposed by Mr. Worsley, seconded by Mr. Hosking, 
was unanimously recommended to Dr. Badger. 
Big bud in black currants. — Mr. Worsley drew attention to a variety of 
black currant which was affected by big bud, but in which the shoot grew 
through the bud, so that growth was not greatly interfered with by the attack. 
Scientific Committee, April 26, 1921. 
Mr. E. A. Bowles, M.A., V.M.H., in the Chair, and five members present. 
Pyrus hybrid. — Mr. J. Fraser showed a hybrid Pyrus which he had collected 
on Leatherhead Downs, and which he regarded as Pyrus intermedia X P. 
Aucuparia. 
Juniperus virginiana galled. — Mr. C. J. Lucas of Warnham Court sent shoots 
of Juniperus virginiana bearing numerous fruiting bodies of the fungus Gymno- 
sporangium confusum, which is perennial in the tissues of Junipers and has a 
summer stage on Crataegus &c. 
Variegated Pelargoniums. — Mr. Hosking showed examples of variegated 
scented Pelargoniums with various types of yellowing of the foliage, all derived 
from one green type which was produced at times upon the variegated plants. 
Albino Orchis mascula. — Mr. Gurney Wilson showed a number of very fine 
spikes of Orchis mascula and an albino form which he had collected wild. 
Fruiting of Prunus Pseudocerasus. — Mr. Bunyard sent fruiting shoots of 
this Prunus, introduced long since by the R.H.S., but now, in the single form, 
exceedingly rare. The plant had fruited at Maidstone under glass. 
Fruit of Prunus triloba. — A branch bearing immature fruit of Prunus triloba 
came from Mr. Geo. Lamb of Hextable. 
Aberrant Narcissus. — Mr. H. J. Chapman showed an inflorescence of Narcissus 
in which the flower had sprung from a stalk at an elbow several inches distant 
from the base of the plant. 
Scientific Committee, May 10, 1921. 
Mr. E. A. Bowles, M.A., in the Chair, and four members present. 
Crown-Gall. — Mr. Fraser showed a Loganberry with a well-developed crown- 
gall on the rhizome due to the attack of Pseudomonas tumefaciens. This organism 
attacks a great number of different plants, but rarely seems to do any great 
amount of damage. 
Drimys Winteri. — Mr. Hosking showed a piece of Drimys Winteri in flower 
from the John Innes Institution at Merton, where it is growing sheltered between 
green-houses. 
Dionaea muscipula. — Mr. Hales showed a plant of Dionaea with small plants 
developing upon the inflorescence. 
Certificate of Appreciation. — A Certificate of Appreciation was, at the instance 
of the Orchid Committee, awarded to Monsieur Graire for work done in raising 
the interesting hybrid between Oncidium macranthum and Odontoglossum 
Thompsonianum (Odontocidium x Graireanum). 
Scientific Committee, June 7, 1921. 
Iceland Poppies malformed. — Mr. Wood of Ashtead showed a number of 
flowers of the Iceland poppy malformed in various ways, some having all their 
stamens transformed into linear petaloid structures somewhat spathulate at 
the tips, others showing various types of duplication of parts, of which the most 
striking was a form with the sepals four and persistent. 
Variations in the foliage of Populus nigra. — Mr. Fraser showed specimens 
of the foliage of a tree, which he believed to be Populus nigra, at different ages 
from the seed, viz. one, two, and seven years, showing the gradual development 
of the mature form of foliage as the tree acquired age. He also showed leaves 
from stool shoots of the same tree measuring up to eight inches across, 
