102 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
legislation. Purchasers of the following Insecticides and Fungicides are advised 
to see that the articles supplied comply with the conditions laid down. 
(i) Lead arsenate paste ; (2) Lime-sulphur ; (3) Nicotine ; (4) Copper 
sulphate ; (5) Soft (Potash) soaps ; (6) Liver of Sulphur ; (7) Sodium and 
Potassium cyanides ; and (8) Formaldehyde. — G. F. W. 
Kniphofia Snowdeni C. H. Wright (Bot. Mag. t. 8867 ; December 1920). — A 
native of Uganda, possibly hardy at Kew, reaching 5 feet in height, with reddish 
flower-buds and yellow flowers, but colour varies. — F. J. C. 
" Larch Blight." A Contribution to the Life-history of the Larch Chermes 
(Cnaphalcdes strobilobius, Kalt). By E. R. Speyer, F.E.S., M.A. (Ann. Appl. 
Biol. vol. vi. Nos. 2 and 3, Dec. 1919, pp. 171-182 ; plates and diagrams). — The 
brunt of the damage is sustained by Larch in the case of young plants, and this 
can be adequately controlled by fumigation. The Spruce does not appear to 
be attacked severely while young. It suggests an opening for a method of control 
by spraying. A method of preparing Aphidae for microscopic examination is 
given. — R. C. S. R. 
Manure, Observations on the Habits of certain Flies, especially those 
Breeding in. By J. E. M. Mellor, B.A. (Ann. Appl. Biol. vol. vi. No. 1, Sept. 
1919, pp. 53-88 ; figs, and charts). — An account, with control measures, of flies 
breeding in manure heaps. — R. C. S. R. 
Melaleuca Radula Lindl. By R. A. Rolfe (Bot. Mag. t. 8866 ; December 
1920). — A newly introduced small, virgate shrub, with narrow spreading opposite 
leaves and large lilac-purple flowers borne in pairs in the leaf axils. Native of 
W. Australia and requiring glasshouse treatment. — F. J. C. 
Mesembryanthemum dichroum Rolfe (Bot. Mag. t. 8872 ; December 1920). 
— Native in S. Africa. Leaves about 4 to 6, i\ inches long, glaucous, fleshy, 
triquetrous ; flowers about \\ inch diameter, white passing to rose at tip of 
petals. — F. J. C. 
Odontoglossum Humeanum Reichb. f. By R. A. Rolfe. — A natural hybrid 
between O. Rossii and 0. cor datum now verified by crossing. (See Journal 
R.H.S. 1919.) — F. J. C. 
Onions, Grades for Northern-grown. By Hartley E. Truax (U.S.A. Dept. 
Agr., Circ. 95, May 1920). — The specifications are based upon extended inves- 
tigations in centres of production and important markets, and it is believed 
that in their present form they will meet the requirements of the Northern- 
grown onion trade. — V. G. J. 
Pears and Apples, A Phytophthora Rot of. By H. Wormald, D.Sc, 
A.R.C.Sc. (Ann. Appl. Biol. vol. vi. Nos. 2 and 3, Dec. 1919, pp. 89-100 ; plate 
and text figs.). — In wet seasons Phytophthora Cactorum sometimes produces a 
rot of apples and pears in this country, causing falling. Dark brown discolora- 
tion of the affected tissue with surface clusters of sporangia, seen with the naked 
eye as glistening particles, characterize the pear rot. In apples the discoloration 
is paler and the sporangia less easily seen. Frequently the skin splits, when 
the mycelium is seen on the exposed surface as a whitish bloom. All rotting 
fruit on ground or tree should be collected and burned. Bordeaux Mixture, 
4 lb. copper sulphate, 4 lb. quicklime, 50 gals, water, is suggested as an effective 
wash in the event of a threatened epidemic. A bibliography is appended. 5 
R.C.S.R. 
Pests, Various. "Notes." By J. C. F. Fryer (Ann. Appl. Biol. vol. vi. 
Nos. 2-3, Dec. 1919, pp. 207-209). — Included in the notes are : (1) Charaeas 
graminis L., (2) Sitotroga cerealella Oliv., (3) Anthonomus pomorum L., (4) 
Phyllobius urticae De G., and P. oblongus L. — R. C. S. R. 
Phlomis spectabilis Falc. By S. A. Skan (Bot. Mag. t. 8870 ; December 
1920). — Discovered in Kashmir and introduced by Mr. Elwes. Quite hardy. 
A perennial herb up to 6 feet in height, with pale rose-purple flowers, in an 
interrupted verticillate spike; basal leaves up to a foot long. — F. J. C. 
Plant Competition, Some Factors in. By Winifred E. Brenchley, D.Sc. 
(Ann. Appl. Biol. vol. vi. Nos. 2 and 3, Dec. 1919, pp. 142-170; plate and 10 
text figs.). — Plant competition is broadly analysed as (1) for food from the 
soil, (2) for water, (3) for light, (4) for the possible harmful effect due to toxic 
excretions from the roots, if such occur, but the mutual action of one plant on 
