. Bulletin. Natural history; Natural history. 242 higher temperatures were due to retarding temperatures or temperatures above the degree of maximum rate of development. To find this point guesses were made and tried out to test their correctness. It was found that by using 85 as the degree of the maximum rate of development, and subtracting twice the average da_y-degrees above 85 (column 7) from the day-degrees above 50, we got a temperature factor (column 8) for each of the temperature groups which when multiplied by the period expressed in days gave the most nearly constant products (column
. Bulletin. Natural history; Natural history. 242 higher temperatures were due to retarding temperatures or temperatures above the degree of maximum rate of development. To find this point guesses were made and tried out to test their correctness. It was found that by using 85 as the degree of the maximum rate of development, and subtracting twice the average da_y-degrees above 85 (column 7) from the day-degrees above 50, we got a temperature factor (column 8) for each of the temperature groups which when multiplied by the period expressed in days gave the most nearly constant products (column 10) for the dif- ferent groups, the average for all groups being 673. This average may be taken as the approximate average of accumula- tions of effective day-degrees for the larval period of larvae reared in apples on the tree. In Graph 4, the average' daily effective day- degrees as recorded in column 8 of Table .3 were plotted against the reciprocals of the periods, with the result that the points in the upper part of the graph were brought nearly into line with the other Gbaph 4. Larval period. Reciprocals of the periods plotted against mean daily effective day-degrees. Larvae reared in apples on tree. The data secured from observations made on 214 larvae reared in picked apples were treated in the same manner as the data for larvae reared in apples on the tree. A summary of the results is shown in Table Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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