1919] FIELD CROPS. 531 



servations on the Fi, Fa, and Fs progeny of a cross between St. "Vincent native 

 cotton, said to be iniinime to E. gossypii, and Soutbern Cross Upland, a suscep- 

 tible type, are beld to indicate that immunity to attack from the blister mite 

 behaves as a simple Mendelian recessive. The Fi was intermediate though in- 

 clining toward the susceptible parent, while the F2 segregated into 100 immune 

 and 365 nonimmune individuals. In the F3 10 of the immune families bred true 

 for immunity, while 37 noninmmne families again segregated into immune and 

 noninmiune. 



The improvement of the yield of Sea Island cotton in the West Indies by 

 the isolation of pure strains, S. C. Haeland (West Indian Bui., 11 {1919), No. 

 8, pp. lJf5~161). — It is stated that through individual plant selection and self- 

 fertilization a mai'ked improvement may be effected in certain morphological 

 characters of Sea Island cotton which have to do with yield. Experimental 

 work conducted in St. Vincent, following the method of pure line selection pro- 

 posed and dealing with the number of ovules or seeds per loculns, number of 

 loculi per boll, and the lint index (weight of lint per 100 seeds) in several 

 strains of Sea Island cotton, is reviewed. The isolation of a strain capable 

 of producing 31 per cent more lint per boll than the ordinary type grown in the 

 island is said to have resulted. 



An improved type of cotton for the southern Maratha country [Bombay 

 Presidency, India], G. L. Kottur (Agr. Jour. India, 14 (1919), No. 1, pp. 165- 

 167, pi. 1). — This briefly describes a long staple cotton developed through con- 

 tinued selection from an erect type of a local variety. The new sort is said to 

 produce 12 per cent more seed cotton, ginning 12 per cent higher than the local 

 strain, and to grade 5 per cent higher than the best local cotton. 



Some of the problems arising out of the successful introduction of Ameri- 

 can cotton in the v/estern Punjab, W. Roberts {Ag7'. Jour. India, 14 {1919), No. 

 1, pp. 4^-48). — It is stated that in 1917 a total of 274,000 acres was planted 

 to American cotton, more than one-half of which was pure 4 F, a selection de- 

 veloped by the economic botanist. In connection with the rapid spread of 

 American cotton culture certain problems, herein briefl.v discussed, have arisen 

 I'elating primarily to the maintenance of a fair market price, the elimination 

 of mixing with so-called " desi " cotton, and the production of pure seed of 

 the preferred 4 F type. 



Egyptian cottons: Their deterioration and means of remedying it, V. M. 

 MossfiRi {Bui. Union Agr. Egypte, 16 {1918), No. 12Jf, pp. 53-79; abs. in Internat. 

 Inst. Agr. [Romel, Internat. Rev. Sd. and Pract. Agr., 9 {1918), No. 12, pp. 

 1441-1443). — The author states that while Egyptian cottons have declined both 

 in production and quality it is more in the nature of a deterioration than a 

 degeneration to be attributed largely to an indiscriminate mixing of varieties. 

 The isolation and purification of superior strains, the dissemination of seed of 

 only approved sorts, and the prevention of subsequent contamination are be- 

 lieved to be essential to the improvement of the crop. The desirability of Gov- 

 ernment aid in achieving this end is discussed. 



Cotton, G. BiGWOOD {London: Constable d Co., Ltd., 1918, pp. YIII+204, pis. 

 16). — This comprises a popular account of the development of the cotton in- 

 dustry, together with a discussion of some of the problems confronting cotton 

 manufacturers at the present time. A paper on Cotton Futures by C. Stewart 

 is appended. 



The early history of cotton in Bombay, J. Mackenna {Agr. Jour. India, 13 

 {1918}, No. 3, pp. 389-404. pl- 1).—A lecture delivered before the Students' Cot- 

 ton Association, Sydenham College of Commerce, Bombay, in January, 1918. 



The work of the Imperial Institute in connection with British cotton cul- 

 tivation {Bui. Imp. Inst. [So. Kensington], 16 {1918), No. 1, pp. 79-89). — The 



