NOTES AND ABSTEACTS. 



775- 



Dr. Bretschneider, Doctor to the Eussian Legation at Pekin, to the 

 Natural History Museum in Paris. Its vdue consists in the colour of 

 its stems — pale yellowish-green, or even sometimes lemon yellow with 

 reddish tips, which in winter produce a striking effect, seen against a 

 background of dark evergreens. — M. L, H, , 



CopnuS flOPida var. pubpa (Bot. Mag. tab. 8315).— Nat. ord. 

 Cornaceae. Eastern N. America, Tree, 40 feet high; leaves broadly 

 elliptical, 5 inches long; bracts 4, petalloid, bright rose; fruit 

 red.— G. H, , ^ 



Copnus macpophylla, On the Influence of Meteopolog^ical 

 Conditions upon the Root-ppessupe of. By M. Miyoshi (Ann. 

 Jard. Bot. Buit. 3rd supp. 1st part, 1910, pp. 97-104; with two figs, 

 and two tables). — The root-pressure of a tree standing in the open 

 varies according to the changes in the meteorological conditions. 

 Among the principal effective agencies must be counted atmospheric 

 condensations, rain and snow, on the one hand and wind upon the 

 other. The former of these makes the pressure-curve a very unifonri 

 one, whilst the pressure- curve is very variable under the influeiace of 

 wind. — R. B. 



CopnuS Nuttallii {Bot. Mag. tab. 8311).— Nat. ord. Cornaceae. 

 W. N. America. Shrub or tree, 50-85 feet in height; leaves 2-4^ 

 inches long; bracts of involucre 6, 3J inches long, yellow, fruit crimson. 



G.H. 



Cotton, Mutative Revepsions in. By 0. F. Cook (U.S.A. Dep. 

 Agr., Circ. 53; 18 pp.). — A discussion of the " reversions " of cottons. 

 This does not necessarily arrive after hybridization, but often in pure- 

 bred stocks. Its interference with Mendelian results is considered, and, 

 in the author's own words, Eeversions transgress the Mendelian 

 program." 



This "program," however, assumes stable varieties as material, 

 and the criticisms therefore will fall water-like from Mendelian backs. 



^ E. A. Bd. 



Cotton, Opig-in of the Hindi. By 0. F. Cook {V.S.A. Dep. Agr. 

 Circ. 42; 12 pp.). — The prevalence of the Hindi (Arabic Indian) cotton 

 in Egyptian samples, on account of its inferior fibre, greatly detracts 

 from the value of high grades. 



The introduction of Egyptian cotton into America brings with it the 

 problem of eradicating the Hindi, and the labour problem there prevents 

 the hand-sorting which is done in Egypt. 



A discussion of its origin is given, and it is considered by the author 

 to show many af&nities with varieties from Mexico, and to be of 

 A.merican origin. — E. A. Bd. 



Cotton Soils, FePtilizePS fOP. By Milton Whitney (U.S.A. 

 Dep. Agr., Bur. Soils, Bull. 62, Sept. 1909).— This bulletin gives in 



