426 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Potato Production. By G. Stewart {Utah Agr. Coll., Circ. 40 ; 54 pp., 
20 figs.) . — The cultivation of the potato in Utah is described. To avoid the great 
loss to the crop caused by Rhizoctonia, Fusarium oxysporum, scab, black stem- 
rot, early blight, tip-burn, and mosaic, the seed potatos, before sprouting, are 
immersed in a solution of corrosive sublimate (4 oz. to 30 gallons of water) for 
one and a half hour, or one pint of commercial formalin to 30 gallons of water for 
two hours. The seed potatos should be selected from prolific croppers. — 5. E. W. 
Potato Tuber, Disease of the : * Internal Rust Spot.* By Sydney G. Paine 
{Ann. Appl. Biol. vol. v. No. i, July 1918, pp. 77-79). — A disease of bacterial 
origin. From one farm at Dunstable 90 per cent, of the crop showed the disease 
so badly as to render it unsaleable. The tubers are perfectly hard and appear 
sound except for a few brown patches on the skin and a certain appearance of 
" scabbiness." Discoloured tissue shows on cutting. Experiments in inoculation 
are described. — R. C. S. R. 
Potato Tuber Moth. By F. H. Chittenden {Board Hort. Oregon, 1919, 
pp. 10 7-1 10; 4 figs.). — Where fields are infested with the potato tuber moth it 
is advisable to cease growing potatos in the district for one year and cultivate 
leguminous crops. All weeds in the neighbourhood must be collected and 
burned. The seed potatos are fumigated with hydrocyanic acid in a specially 
constructed shed. Carbon di-sulphide may also be used at the rate of i oz. to 
a 96 lb. barrel or 3 lb. to 1000 cubic feet space. The exposure must not 
last more than twenty-four hours. — S. E. W. 
Potatos, Genetic Studies in : the inheritance of an abnormal haulm type. 
By R. R. Salaman and J. W. Lesley {Jour. Gen. x. pp. 22-36 ; July 1920). — 
A prostrate variety of potato arose among seedlings grown at Barley. The 
anatomical peculiarities of the prostrate form are described and the genetical 
constitution is worked out. The variety breeds true to the prostrate habit, and 
it differs from the normal in at least two and possibly in three factors. — F. J. C. 
Primula bellidifolia King. By J. Hutchinson {Bot. Mag. t. 8801, June 1919). 
— A blue purple species of the Capitatae section with coarsely -toothed setulose 
leaves. Native of Sikkim and Bhutan, whence it was introduced by Messrs. 
Bees. It is quite hardy but unfortunately monocarpic. — F. J. C. 
-| Primula chionantha Balf. f. et Forrest. By J. Hutchinson {Bot. Mag. t. 8816 ; 
Sept. 1919). — Collected in Yunnan by Mr. G. Forrest in 1913. A robust farinose 
species with flowers in verticils or umbels, of a whitish colour, about an inch in 
diameter. It appears to be monocarpic but produces abundant seed. — F. J. C. 
Primula pulvinata Balf. f. et Ward. By J. Hutchinson {Bot. Mag. t. 8836 ; 
March 1920). — Discovered by F. Kingdon Ward in Yunnan at 11,000 ft. 
elevation. A small cushion plant with short 2- to 3-flowered peduncles and golden- 
yellow flowers. Its hardiness is at present in doubt, but it has succeeded in the 
same conditions as P. Forrestii. — F. J. C. 
Primula spicata Franch. By J. Hutchinson {Bot. Mag. t. 8821 ; Dec. 
191 9). — Found by the Abbe Delavay near Tali in W. Yunnan, and introduced 
by Mr. G. Forrest. It is unfortunately monocarpic, like most of its relatives, 
though hardy and easy to raise from seed. It is nearly alhed to P. chasmophila, 
but differs in the loose arrangement of the flowers, in the leaves, and in the 
farinose upper part of the peduncle and the calyx. — jF. /. C. 
Pruning, Young Deciduous Trees. By W. P. Tufts {U.S.A. Exp. Sin. Calif., 
Bull. 313, figs.)- — This report deals with the early training of most kinds of 
fruit-trees in California. Light pruning is advocated, since it is claimed that 
lightly pruned trees come into bearing from one to three years earlier than 
heavily pruned ones ; that they have stockier and stronger branches, and show 
greater all-round development. Summer pruning is also discussed, it is said 
that this form of pruning is weakening, and results in slightly smaller trees, 
but under certain conditions may hasten profitable production. Tables are 
given which contain much interesting data. — A . N. R. 
Rhododendron dichroanthum Diels. By J. Hutchinson {Bot. Mag. t. 8815 ; 
Sept. 1919). — Discovered by Mr. G. Forrest in Yunnan. Flowered at Caerhays 
in May 191 8. Nearly related to D. neriifloriim, but the lower surface of the 
leaves is mealy and the stamens puberulous. The corolla is purplish-red in the 
plate, but creamy or yellowish-rose forms have been found. — F. J. C. 
