442 EXPERIMENT STATION RECORD. 



stronger mixture and does not injure the foliage appreciably. Bordeaux mix- 

 ture was of no value as a remedy for peach scab, whereas self-boiled lime- 

 sulphur proved an almost complete preventive of this disease. Self-boiled lime- 

 sulphur was also more effective as a remedy for peach rot. When 2 lbs. per 

 barrel of arsenate of lead was added to the spraying mixture, the fruit on the 

 sprayed trees was noticeably less wormy than on the unsprayed trees. The 

 results of the spraying experiments as a whole indicate that it is profitable to 

 spray. With the 3 varieties most affected by rot, all unsprayed trees produced 

 no marketable fruit whereas there was an average yield of $1.87 per tree from 

 the sprayed trees. The cost of spraying is estimated at 10 cts. per tree for each 

 application, or 30 cts. for the season. 



The experiments in thinning have thus far shown the operation to be profit- 

 able in producing marketable fruit which, as indicated by check trees, would 

 otherwise have been unsalable. 



Coal and wood fires were tried in the orchard as a means of protection from 

 frost with the result that the temperature was raised from 4 to 6° and the 

 crop saved. 



The development and aims of grape grafting, K. Kroemeb {Jahresber. Ver. 

 Angew. Bot., 7 {1909), pp. 1-22). — A review of our knowledge relative to the 

 grafting of grapes, including an extensive bibliography on the subject. 



Notes on some cacaos at the Dominica Botanic Station, J. Jones ( West 

 Indian BiiL, 10 (1910), No. 4, pp. 337-3Ji3, pis. 2). — Descriptive notes are given 

 of the alligator cacao (Theobroma pentngona) , and the tiger cacao (T. bicolor), 

 together with a brief note on the monkey cacao (T. august if olia). Cultural 

 expei-iments with the alligator cacao show that it is quite unsuitable for the 

 conditions existing in Dominica owing to its delicate character and its tendency 

 to become affected with canker of the stem. 



The committee on researches and experiments, A. Fredholm et al. {Proc. 

 Agr. Soc. Trinidad and Tobago. 10 {1910), No. 6, pp. 183-208) .—This is the re- 

 port of the committee on subjects selected for cooperative investigation and 

 relating for the most part to various phases of the cacao industry. The experi- 

 ments are described and the form of record to be used in each case is shown. 



Pruning coffee, A. P. do Amaral (Bol. Inst. Agron. [Sao Paulo], 1909, No. 12, 

 pp. Jf20-/i34, figs. -'/). — Practical suggestions are given for pruning and disbud- 

 ding coffee. 



The inheritance of peloria and flower color in foxgloves (Dig'italis pur- 

 purea), F. Keeble, Miss C. Pellew and W. N. Jones (New Phytol., 9 {1910), 

 No. 1-2, pp. 68-77, figs. 2; abs. in Gard. Chron., 3. so:, 1,7 (1910), No. 1226, p. 

 417), — From these experiments, which were conducted at the Botanic Labora- 

 tory, University College, Reading, the following conclusions were reached : 



" Peloria in foxgloves is a Mendelian recessive to normal. Peloric flowers 

 and also the nonpeloric flowers of peloric plants carry the recessive character. 

 The allelomorphs responsible for color are as follows: Mm, M being magenta 

 color factor, dominant to m ; Dd, D being a darkening factor dominant to d and 

 converting magenta to purple; and Ww, W being a dominant white factor in 

 the presence of which the expression of color due to M is inhibited so that the 

 flowers are white. All flowers appear to be spotted. In the presence of the 

 color factor M, spots are red ; in the absence of M they are yellow-brown. The 

 presence of the dominant white factor W does not inhibit the expression of the 

 color factor M in regard to the spots (at least when present as a heterozy- 

 gote=Ww). The suggestion that dominant white acts differentially on ground 

 color, inhibiting it generally but not in spot-areas, may prove of service in 

 explaining the origin of bars, spots and stripes in plants and animals and also 

 the behavior of certain eversporting varieties." 



