42 EXPERIMENT STATION RECORD. 



Lax and dense-eared wheats, W. H. Parker {Jour. Agr. /Sci [England], 

 6 il91Jf), No. 3, pp. 3111-386, pi. 1, fig. 1). — This paper discusses methods of 

 earlier investigators in determining the density of heads of wheats in maliing 

 classifications, and gives results of experiments to show the advisability of 

 using accurate measurements of the iuternodes of the rachis from which aver- 

 ages for the heads were obtained to indicate the different classes of density, 

 as well as in a study of the factors that make for dense or las heads. 



The effect of rate of seeding on competition in wheat varieties, A. E. 

 Grantham (Jour. Amer. Sog. Agron., 6 {1914), No. 3, pp. 124-128). — The results 

 of sowing a large number of varieties of wheat at the rates of 100, 200, and 

 400 kernels per 10 feet of row show for bearded varieties the decrease in 

 yield of grain from the thin to the medium seeding to be 18 per cent, from 

 the medium to the thick 23 per cent, and from the thin to the thick 37 per 

 cent. For the beardless varieties the decreases were 34, 51, and 68 per cent, 

 respectively. 



" These results indicate that there is a great difference in varieties as to 

 the effect produced by the competition induced by the different rates of seeding. 

 It appears that the beardless varieties are less able to withstand the heavier 

 seeding." 



Wheat, — A practical discussion of the raising, marketing, handling, and 

 use of the wheat crop, relating largely to the Great Plains region of the 

 United States and Canada, A. M. Ten Eyck {Lincoln, Nebr., 1914, pp. 194, 

 figs. 39). — This book, especially prepared for the wheat growers of the dry land 

 farming section of the United States, embodies the author's experience on the 

 raising, marketing, handling, and uses of the wheat crop. 



The value of the biological method of determining varieties of agricul- 

 tural seeds, A. Cauda {Ann. R. Accad. Agr. Torino, 56 {1913), pp. 357-376). — 

 This article discusses the precipitin method and gives results of trials with 

 several genera of agricultural seed which show that all genera do not respond 

 to the serum treatment. A bibliography of 18 titles is appended. 



Zellers' barley and ear corn table for wagonloads, M. T. Zellers {Hooper, 

 Nelr., 1911, pp. 44)- — This gives values of loads of barley weighing from 1,400 

 lbs. to 3,790 lbs., and of ear corn weighing from 1,600 lbs. to 3,990 lbs. at 

 prices ranging from 25 cts. to 74 cts. per bushel. 



HORTICTJLTTTRE. 



The killing of plant tissue by low temperature, W. H. Chandler {Missouri 

 8ta. Research Bui. 8 {1913), pp. 143-309, pis. -J).— The work reported in this 

 paper was begun during the season of 1904-5. While the studies were under- 

 taken primarily to determine the effect of certain cultural methods on the hardi- 

 ness of peach fruit buds under climatic conditions that prevail in the southern 

 half of Missouri, they have been so extended as to embrace a general study of 

 the " freezing to death " of plant tissue. In addition to peaches and other 

 orchard fruits many vegetables and other cultivated plants have been included 

 in the author's experimental studies. The results of this work are here tabu- 

 lated and fully discussed in connection with the results secured by various 

 investigators. An extensive bibliography of cited literature is given. The sub- 

 ject matter is presented under the following general headings: Review of lit- 

 erature on freezing, effect of sap density on temperature, other features that 

 influence the freezing to death of plants, effect of previous exposure to tempera- 

 ture slightly above killing temperature, relation of low temperature to peach 

 growing, varieties with the longest rest periods, effect of vigor of trees on rest 



