 Investigations conducted by the Biological Survey have shown that the northward distribution of terrestrial animals and plants is governed by the sum of the positive temperatures for the entire season of growth and reproduction, and that the southward...  Bulletin - Էջ 441898Ամբողջությամբ դիտվող - Այս գրքի մասին
 | 1914 - 826 էջ
...growth and reproduction," and (2) that "animals and plants are restricted in southward distribution by the mean temperature of a brief period during the hottest part of the year," in general, hold true in regard to insect distribution. The importance of determining the optimum... | |
 | Georgia State Horticultural Society - 1908 - 140 էջ
...governed by the sum of the positive temperature for the entire season of growth and reproduction, and the southward distribution is governed by the mean...temperature of a brief period during the hottest part of the year." Does this help us in determining how far north or south a given fruit may be grown? Not at all,... | |
 | 1895 - 592 էջ
...total quantity of heat during the season of growth and reproduction, and in southward distribution by the mean temperature of a brief period during the hottest part of the year. The anomalous intermingling of boreal and austral types which occurs over an extensive area of... | |
 | United States. Department of Agriculture - 1895 - 632 էջ
...temperatures for the entire season of growth and reproduction. In southward distribution they are restricted by the mean temperature of a brief period during the hottest part of the year. It is believed that these two principles cover the fundamental facts of distribution. BECAPITUL... | |
 | 1895 - 656 էջ
...governed by the sum of the positive temperatures for the entire season of growth and reproduction,2 and that the southward distribution is governed by...distinctive temperatures of uhe three Boreal zones (Arctic, Iludsonian, and Canadian) are not positively known, but the southern limit of the Boreal as a whole... | |
 | 1895 - 634 էջ
...temperatures for the entire season of growth and reproduction. In southward distribution they are restricted by the mean temperature of a brief period during the hottest part of the year. It is believed that these two principles cover the fundamental facts of distribution. RECAPITULATION.... | |
 | Clinton Hart Merriam - 1898 - 92 էջ
...the entire season of growth and reproduction,2 and that the southward distribution is governed by Hie mean temperature of a brief period during the hottest...Boreal as a whole is marked by the isotherm of 18° C. (04.4° P.) for the six hottest consecutive weeks of summer. It seems probable, from the few,data available,... | |
 | Clinton Hart Merriam - 1898 - 92 էջ
...for the entire season of growth and reproduction? and that the southward distribution is governed l>y the mean temperature of a brief period during the...Canadian zones. — The distinctive temperatures of Jie three Boreal zones (Arctic, Hudsonian, and Canadian) are not positively known, but the southern... | |
 | 1899 - 588 էջ
...MEXICO AGRICULTURAL EXPERIMENT STATION. IT has recently1 been laid down by Dr. CH Merriam that " the northward distribution of terrestrial animals and...temperature of a brief period during the hottest part of the year." Dr. Merriam further explains that, " in computing the sum of the positive or effective temperatures,... | |
 | 1899 - 1030 էջ
...MEXICO AGRICULTURAL EXPERIMENT STATION. IT has recently1 been laid clown by Dr. CH Merriam that " the northward distribution of terrestrial animals and...temperature of a brief period during the hottest part of the year." Dr. Merriam further explains that, "in computing the sum of the positive or effective temperatures,... | |
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