Memoir Volume 1-5

Memoir Volume 1-5

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 edition. Excerpt: ...of oats are incorporated in this paper and need not be discussed here. Whitcomb (1913) reports biometrical results on two varieties of barley. The coefficients of correlation for average of plant, of the two varieties, are given in the table on the following page. DEVELOPMENT AND VARIATION The means, standard deviations, and coefficients of variability for the different characters under observation are given in Table 3. The mean.239 006 for 1912, .241 .006 for 1910, .257 004 for 1908, and.315 .007 for 1909. The least variation exists where the mean is largest, but the decrease is not in proportion to the decrease in the mean. for average height of plant in centimeters is 52.990 .181 for 1908. The plants were grown in drill rows, and the conditions were not so favorable for the development of tall culms in that year as they were in later years. The means for average height in the other years are, in order of value, 70.840 .234 for 1910, 75.200 .182 for 1912, and 76.110 .277 for 1909. The differences in height are not great for these years. The variability for this character as indicated by the standard deviation is greatest for 1909 (the year for which the mean is largest), being then 9.188 . 196; but the variability for 1908, 7.715 .128, is next in order although the mean is smallest for that year. This doubtless results from the fact that culms were then the units. For 1912 the variability is least, being then 5.405 .129; for 1910 it is 6.950 .166. The means for the total yield of plant vary from 3.458 .045 grams for 1910 to 4.032 .068 for 1909 and 7.962 113 for 1912. The variation as indicated by the standard deviations is in the same order, being 1.323 .032 more

Product details

  • Paperback | 102 pages
  • 189 x 246 x 5mm | 195g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236509277
  • 9781236509277