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Twenty-three trees from widely different geographic locations and different environments were analysed for the 8D and 8 13 C records. The 8D values suggested that the temperature of the Earth’s surface rose over the past 100 years and probably for the past 1000 years. The rate of warming appears to be latitude dependent, greatest in the cooler areas. The 8 13 C record, obtained for seven of the 23 trees, contain the 8 13 C decrease due to the anthropogenic effect, the addition of CO 2 from coal and petroleum burning. This effect appears to be twice as high in the Northern Hemisphere as in the Southern Hemisphere.

The measurements by Brfickner (1963) of the Ca 1 4227 polarization at the Sun's limb provides us with a test for the theory of line polarization. Computations are developed taking into account: (a) the transfer polarization, due to the anisotropy of radiation field; (b) the depolarizing collisions acting in the wings. The magnetic field is not taken into account and the theory is not valid in the Doppler core. In the wings a very good fit is obtained, using appropriate source-functions fitting the observed profiles at the center of the disk, and from center to limb.

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