In order to determine the degree to which the sequoia record represents the rainfall of other regions, let us select Jerusalem for comparison. The reasons for this selection are that Jerusalem furnishes the only available record that satisfies the following necessary conditions: (1) its record is long enough to be important; (2) it is located fairly near the latitude of the sequoias, 32 deg.N versus 37 deg.N; (3) it is located in a similar type of climate with winter rains and a long dry summer; (4) it lies well above sea level (2500 feet) and somewhat back from the seacoast, thus approximating although by no means duplicating the condition of the sequoias; and (5) it lies in a region where the evidence of climatic changes during historic times is strongest. The ideal place for comparison would be the valley in which grow the cedars of Lebanon. Those trees resemble the sequoias to an extraordinary degree, not only in their location, but in their great age. Some day it will be most interesting to compare the growth of these two famous groups of old trees. +-------------------------------------------------------------------+ | TABLE 4 | | | | CORRELATION COEFFICIENTS BETWEEN | | RAINFALL RECORDS IN CALIFORNIA | | AND JERUSALEM | | | | (_r_) = _Correlation coefficient_ | | (_e_) = _Probable error_ | | (_r_/_e_) = _Ratio of coefficient to probable error_ | | | | A. JERUSALEM RAINFALL FOR 3 YEARS AND VARIOUS GROUPS OF | | SEQUOIAS[27] | | | | (_r_) (_e_) (_r_/_e_)| | ------ ----- ---------| | 11 trees measured by Douglass +0.453 +-0.078 5.8 | | 80 trees, moist locations, Groups IA, | | IIA, IIIA, VA +0.500 +-0.073 6.8 | | 101 trees, 69 in moist locations, 32 in | | dry, I, II, III +0.616 +-0.061 10.1 | | 112 trees, 80 in moist locations, 32 in | | dry, I, II, III, V +0.675 +-0.053 12.7 | | | | B. RAINFALL AT JERUSALEM AND AT STATIONS IN CALIFORNIA AND NEVADA | | |