436 EXPERIMENT STATION RECORD. [Vol.41 



recommended as a general purpose variety for the State as a whole, while 

 other varieties are recommended for special conditions. Rust, smut, ergot, 

 stripe disease, and blight are regarded as among the important barley diseases, 

 while control measures include early seeding, seed disinfection and grading, 

 and the rotation of crops. 



Barley responded readily to good rotation methods. It is recommended that 

 a firm seed bed be prepared with a shallow mulch. Early seeding is deemed 

 very important. Six pecks per acre was found to be the best rate of seeding 

 in general, and the proper depth of seeding about 2 in. Seeding with a di'ill is 

 recommended. 



It is stated that barley can be grown as a cultivated crop to good advantage 

 in sections where corn is not a highly profitable crop. Careful shocking and 

 stacking is strongly advised in order to secure grain of good market quality. 



A reason for the contradictory results in com experiments, L. Carrieb 

 {Jour. Amer. Soc. Ayron., 11 {1019), No. 3, pp. 106-113). — In this paper, a con- 

 tribution from the Bureau of Plant Industry, U. S. Department of Agriculture, 

 the author discusses briefly the unreliability of the common methods of variety 

 and ear-to-row testing of corn whereby the influence of the pollen on the size 

 and yield, of grain is overlooked, although this factor may affect the results 

 as much or more than inherent differences in the corn under examination. It 

 is suggested that tlie farmer be advised to continue to select seed corn con- 

 forming to the well established types of the locality and occasionally to intro- 

 duce some seed from an outside source, preferably of the same variety, but 

 not closely related to his own strain. 



Finally it is stated that " corn still offers great opportunities to the agron- 

 omist who will break away from the old methods of conducting experiments 

 and work in the light of all the known facts regarding this crop. A method 

 must be followed which will allow the plants to develop normally and at the 

 same time effectually control the matter of pollination. The equipment for 

 such experiments will be expensive, but relatively no more so than that tiB«d 

 in lysimeter and some other work. The importance of the corn crop wouJd 

 seem to justify any such outlay of public funds," 



Some factor relations in maize with reference to linkage, D, F, Jones and 

 C. A. Gallastegui {Amer. Nat., 53 {1919), No. 626, pp. 239-2J,6).— The authors 

 describe what they consider to be " a fairly good case of linkage between the 

 tunicate factor which determines the production or inhibition of the glumes 

 covering the seeds and the factor for starchy or sweet endosperm," and discuss 

 evidence secured by other investigators I'elative to linkage in corn. 



A half-tunicate ear produced from open-pollinated seed of a perfect flowered 

 segregate was self-pollinated. Upon examination this ear was found to have 

 segregated into 173 starchy and 43 sweet seeds. Assuming linkage, a classifi- 

 cation of F2 progeny into starchy tunicate, starchy nqntunicate, sweet tunicate, 

 and sweet nontunicate plants is said to agree rather closely with the nearest 

 theoretical results. Observations on the progeny of a similar ear crossed with 

 a yellow, starchy, nontunicate corn is said to show no indication of linkage be- 

 tween the factors for tunicate ear and yellow endosperm. 



It is stated further that " since the number of known factor differences in 

 maize is already some three or four times the number of chromosomes, more, 

 definite knowledge of the behavior of all these factors in relation to each other 

 will be awaited with iiitei-est, especially since maize is one of the best ma- 

 terials from the plant side to which the {'hromo.sonie liypothesis, as worketl 

 out in Drosophila, can look for contradiction or support." 



Structure of the maize ear as indicated in Zea-Euchlsena hybrids, G. N. 

 Collins {Jour. Agr. Research [V. S.], 11 {1919), No, 3, pp. 127-135, pl8. 3, fig. 



