FIELD CROPS. 835 



all the dominant colors of the parts in which the 2 types differed in color, 

 and the other type all the recessive colors. There was apparently an absolute 

 correlation (presumably a genetic correlation) between color of cobs, pericarp, 

 huslis, silks, and anthers." 



Data are also presented showing spurious allelomorphism in maize and a 

 few cases in which a dominant color of the cob is aUelomorphic to a dominant 

 color of the pericarp. The author considers that spurious allelomorphism 

 occurs with respect to cob and pericarp colors in maize and bases his strongest 

 evidence upon the gametic analysis of the Fi plants made possible by crossing 

 them with plants laclcing genes of the characters concerned. 



A comparison is made of genetic correlation and spurious allelomorphism and 

 the relation of each to the way in which genes are associated in the gamete is 

 discussed at length. Attention is called to the possible genetic correlation of 

 sizes and other characters, in which there is noted an interesting case of corre- 

 lation in maize between dwarfness and broad leaves, the presence of stamens 

 throughout the ear, club-shaped tassels, and defective anthers. This correla- 

 tion was observed in 3 families of corn in 1910. Considering the 3 families 

 together there were 107 of the tall monoecious plants and 25 of the dwarf 

 andromonoecious ones at the time the plants had finished their growth, thus 

 showing definite correlation. In 2 of the families height characters wore found 

 to be sharply segregated. 



The author discusses his observations with respect to the possible behavior 

 of the genes which represent the characters of maize in the chromosome. 



Muslin screens to keep corn from crossing, L. Carrier (Virginia Sta. Rpts. 

 1909-10, pp. 119-123, figs. 4). — These pages describe the method of construction 

 of muslin screens used for the prevention of cross pollination of corn on 

 adjacent experiment plats. 



During 190S the muslin partitions were 10 ft. high and the plats were roofed 

 in, but with this method heat collected and weakened the stalks so that some 

 of them broke of their ovm weight. In 1909 the same partitions were raised 

 3 ft. from the ground and no covering was used. This method apparently did 

 not weaken the plants and there was " little evidence of crossing of varieties — 

 no more than we found in our isolated, pure bred plat." 



During some of the heaviest gales, little indication of air currents inside the 

 inclosure was observed. The author notes that there was no outside corn 

 immediately adjoining the plats and believes that if there had been, pollen 

 would doubtless have been blown over into the inclosure. Boone County White 

 and Leaming were used and crossing would have been quite noticeable. 



Gottingen oats, I, II, III, IV, O. Tornaxj (Jour. Landw., 59 (1911), No. 2, 

 pp. ISl-lS-i). — This article describes with great detail the morphological char- 

 acters of these different varieties of oats, originated at the Gottingen Experi- 

 ment Station, and the characteristics of each variety of particular value to 

 the farmer and plant breeder are also enumerated. 



The sweet potato, B. H. A. Groth (Contri'b. Bot. Lab. Univ. Perm., Jf (1911), 

 No. 1, pp. 10 Jf, pis. 5.'i). — This work is a review of the historical records of 

 Tpomoea hatatas, made for the purpose of furnishing a working basis for future 

 experimentation with its many varieties. A chapter each is devoted to the 

 following topics: Origin and history, economic importance, the structure of 

 I. batatas, and classification of varieties. 



Summary of experiments in the culture of Sumatra tobacco under shelter, 

 W. Fkear and E. K. Hibshman (Pennsylvania Sta. Rpt. 1910, pp. 238-2Jf3, pis. 

 2). — After a discussion of the cultivation, harvesting, and cost of production of 

 Sumatra tobacco under shelter, the authors conclude that its cost of production 



