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By F. S. Bodenheimer (auth.)

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Where a = age of population in days, e = constant daily oviposition rate. The age-distribution after the 63rd day is of the typical bell shape of a stagnant population. The age-structure of a population serves, if the bionomic constants for the species are known, as an important indicator of the character of the life-table of the population concerned. 5. Relation between the Three Ecological Ages From a physiological point of view the relative age of an organism may be divided into many categories, depending on growth of weight, size, linear growth, etc.

Showed at Degania in the Upper Jordan Valley a considerably longer development than could be expected from the hyperbola based upon breedings on the coastal plain. Investigation revealed that the water content of the wheat was 8% in Degania, as against about 12% on the coastal plain, which explained the difference adequately 7 . (4) The annual fluctuations of the sum of local effective temperatures above the thermal constant have been of great use in explaining the local fluctuations of important pests.

9. Climograms of Anychus latus: A t o C. in Palestine; A. at Jericho; B . at Dagania; C. at Rehobot; D. in various localities: a. at Paris; b. at Naples; c. at Ankara; d. at Cairo; e. at Khartoum; f. at Louren<;o Marques. 53 circumscribe at least one climatically favourable zone. In the best case, we may be able to circumscribe an optimal, favourable, unfavourable, and impossible climatic zone. Whenever this zonation is based on sufficiently large empirical data it becomes highly important for the understanding of seasonal fluctuation, local gradation, and geographical distribution.

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