ABSTRACTS. 



919 



the thermometer has a range of 100 degrees Fahrenheit. Moreover, the 

 larvae cannot stand the hot burning sun ; they like a humid atmosphere. 

 Its northern spread is probably unlimited, until the Arctic region is 

 reached, for prolonged frosts do not affect the hibernating beetles. The 

 greater length of winter and the greater cold would only reduce the 

 number of broods. 



" Yet we must not forget that the genus to which this germ belongs 

 is southern rather than northern, the Colorado beetle itself occurring as 

 far south as Mexico. It breeds and flourishes in numbers in Kansas, and 

 in places where the temperature has a still greater range, so that too 

 much reliance cannot be placed on Riley's statement referred to above." 



The concluding chapters deal with the natural enemies and closely 

 related beetles. — B. N. 



Commercial FertilisePS {U.S.A. Exp. Stn. Kentucky Bull. 95; 

 September 1901). — This bulletin contains an elaborate series of tables of 

 the results of analysis of a large number of commercial fertilisers, with 

 the names of the manufacturers, name of the brand, and percentage of 

 constituents. See also Exp. Stn. Connecticut, 1901. — M. C. C. 



Composts for General Potting-. By H. Dauthenay {Bev. Hort. 

 pp. 477-80 ; October 1901). — A long and interesting article specifying 

 composts used by numerous specialists for various plants for cuttings and 

 potting on.— C. T. D. 



Cork-Oaks. By J. Daveau {Bull. Soc. Bot. France, xlvi. 1899 ; Sess. 

 Extraord, a Hyeres, Mai 1899 (published November 1901), pp. Ixxxvi- 

 xci). — Discusses the specific distinctness of the two Cork-oaks, Quercus 

 Suher, L., and Q. occidentalis. Gay. The conclusion arrived at is, that in 

 Spain, Portugal, and Algeria there is no sufficient ground for separating 

 the two as species. In France Q. occidentalis appears to be a race 

 adapted to an Atlantic climate. It is distinguished by its deciduous 

 foliage, and by the acorn taking two years, instead of onlv one, to ripen 



A. W. B. 



Cosmos, Hybrids of, and Autumn Sowings. By Gustavo 

 Courtois {Bev. Hort. pp. 480-1 ; October 1901). — Two woodcuts of a 

 large flowering hybrid (? cross or sport) of C. hipinnatus. Handsome 

 plant, with flowers 2^ inches in diameter, with finely dissected foliage. 

 Autumn sowing advisable, as the new form flowers later than the normal. 

 Stands a little frost, but not hardy. — C. T. D. 



Crab Trees. By E. D. S. {Jour. Hort. p. 440 ; November 14).— 

 Several kinds are mentioned, which are ornamental both in flower and 

 in fruit.— C. W. D. 



Crassula tenuis. By A. H. Wolley Dod {Joum. Bot. 468, p. 399 ; 

 12/1901). — Description of new species from the Cape Peninsula. — G. S. B. 



Cratseg-US, The Genus. By W. J. Bean {Gard. Mag. 2,511, p. 826 ; 



14/12/1901). — A descriptive account of the cultivated species of Cratcegus 

 (Thorns), written in the same thorough way as previous articles on trees 



