482 JOUBNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Pine and Douglas fir forest. " South Park " is xerophytic. (4) Mon- 

 tane Zone, 8000-10,000 feet. Pinus contorta var. Murrayana domi- 

 nant, with P. aristata, P. flexilis, Picea Parry ana, and Abies lasiocarpa. 

 Populus tremuloides is dominant in some places with oak shrubbery. 

 (5) Sub- Alpine Zone, 10,000 feet to timber line. Engelmann Spruce 

 dominant, with Salix, Betula, Ribes, and Vaccinium; average height of 

 timber line, 11,500 feet. (6) Alpine Zone, grasses and low alpine mat- 

 forms. Amongst these are several British alpines (Silene acaulis, 

 Deschampsia caespitosa, Phleum alpinum, &c.). (7) San Luis valley, 

 chiefly Artemisia tridentata with Chrysothamnus, Atriplex, &c. Coni- 

 fers occur on the slopes. (8) Middle Park has a similar vegetation. 

 (9) Western Sage Plains and Lower Footittlls. Sage brush, Pinus 

 edulis, Scrub Oak, and Eocky Mountain yellow pine. The Coniferae 

 are found up to 7500 feet cn hills. The sage plains stretch from, 

 the streams to the hills. Alkaline flats are covered with Ohenopo- 

 diaceae. Oak chaparral often forms a distinct zone between P. edulis 

 and the montane zone. Below 8000 feet the climatic and zonal rela- 

 tions are quite different on the eastern and western slopes of the Eocky 

 Mountains respectively. — G. F. S.-E. 



Compositae, Ray-florets of. By H. Nakano (Bot. Gaz. vol. 

 xlix. pp. 371-378; with 4 figs. ; May 1910). — The author has examined 

 the variation in number of ray and disc florets of Aster fastigiatus. He 

 finds that there is one mode which does not belong to the Fibonacci 

 series. There is a distinct seasonal chang.^ in the number of rays. The 

 classes in individual variation appear to be almost continuous. The 

 coefficient of correlation between the ray and disc florets was found to 

 be 0-3219 ± O'Olll.— G. F. S.-E. 



Cotton, Egryptian, Experiments with, in 1908. By T. H. 



Kearney and W. A. Peterson {IJ.S.A. Dep. Agr., Bur. PI. Ind., 

 Circ. 29; 1909). — These experiments showed, among other results, that 

 acclimatized seed was better than newly imported, and that cross- 

 fertilization, with corresponding deterioration, was inevitable if upland 

 cotton was grown anywhere in the vicinity of Egyptian cotton. 



The development of the branches which bear the bolls was found 

 to be largely influenced by the time of planting and the way in which 

 irrigation was managed. The planting should be as early as possible, 

 and irrigation sufficient, especially in the later stages of growth, to 

 prevent a check to the plant through undue wilting and slow recovery 

 in hot weather. Given careful cultivation on not too large a sc&le, 

 and co-operation between farmers, in order to market an even sample, 

 there is no reason why an excellent quality of Egyptian cotton should 

 not be produced in Arizona. — C. H. L. 



Cotton in the West Indies {West Indian Bull. vol. x. No. 2, 

 pp. 153-167 ; 1909). — Some of the West Indian islands show an increase 

 in the acreage under cotton cultivation, in others the sugar-cane remains 



