346 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Rhubarb, Cultivation of, for Medicinal Purposes. By E. 



M. Holmes (Gard. Chron. May 16, 1914, p. 327). — Success depends 

 on well-drained but not dry soil, and presence of lime. 



Rheum Rhaponticum, R. palmatum var. tanghuticum, and R. 

 officinale are those grown in England. The produce of R. officinale 

 is said to be as efficacious as that of the Chinese root. — E. A. B. 



Ribes laurifoiium (Bot. Mag. tab. 8543). — Western China. Nai. 

 Ord. Saxifragaceae, Tribe Ribesieae. Shrub, 5-6 feet high. Leaves, 

 short, 2J-4 inches long. Racemes pendulous, if inch long, up 

 to i2-fiowered. Flowers greenish petals -^^ inch long, spathulate. 

 Fruit wide-elliptic, reddish, f inch long. — G. H. 



Rice, Assimilation of Nitrogen by. By W. P. Kelley [U.S.A. 

 Exp. Stn., Haw., Bull. 24, June 1911). — The author discusses various 

 fertihzers for rice, and recommends the use of sulphate of ammonia, 

 as it was found that the various nitrates caused an increase of injurious 

 compounds in rice soils. — C. P. C. 



Rondeletia cordata (Bot. Mag. tab. 8540). — Guatemala. Nat. Ord. 

 Rubiaceae, Tribe Condamineae. Shrub, 4-6 feet high. Leaves ovate 

 or elliptic-ovate, 2J-7 inches long. Cymes terminal, many-flowered, 

 4J inches wide. Flowers, with reddish-purple corolla-tube and rose- 

 coloured lobes, J inch across. — G. H. 



Root Crops, Fertilizer and Seeding Experiments with. By C. F. 



Clark and E. R. Minns [U.S.A. Exp. Stn., Cornell, Bull. 267, May 

 1909). — The authors recommend on a clay loam soil 12 lb. seed to the 

 acre, hand drilled. They do not advise saving own seed. In the 

 fertilizer experiments, nitrate of soda with soluble acid phosphate, 

 given in the proportion of 120 lb. nitrate of soda, 240 lb. acid phosphate, 

 gave best results. — C. P. C. 



Rose Slug-Caterpillar, The, By F. H. Chittenden, Sc.D. 

 [U.S.A. Dep. Agr., Bur. Entom., Bull. 124, Oct. 1913 ; i fig.). — 

 This caterpillar feeds on rose, oak, plum, dogwood, apple and pear, 

 but does not appear to do very considerable damage. It is the larva 

 of a moth [Euclea indeterminata) and undergoes eight or nine distinct 

 stages before transforming to pupa. In stage i, which is passed rapidly, 

 it takes no food. The species hibernates in its cocoon, and the moth 

 has generally been observed to issue in July. — F. G. J. 



Salvia uliginosa [Bot. Mag. tab. 8544). — Eastern South America. 

 Nat. Ord. Labiatae, Tribe Monardeae. Herb, 8 feet high. Leaves 

 oblong-lanceolate, 3J inches long. Inflorescence terminal. Verticil- 

 lasters 7-20 flov/ered. Corolla, blue lip, 3-lobed, -J inch long. — G. H. 



Scale Insects of Mississippi, Some. By Glenn W. Herrick 

 (U.S.A. Exp. Stn., Miss., Tech. Bull. 2, Feb. 191 1 ; 23 plates). — 

 Scale insects occur on all kinds of plants, both cultivated and wild, 



