- As already intimated, our knowledge of palaeometeorology, or of past climates, is
**derivable**chiefly from fossils. - The fact that both male and female costume amongst the primitive Aegean peoples is
**derivable**from the simple loin-cloth with additions is rightly used by Mackenzie as a proof that their original home is not to be sought in the colder regions of central Europe, but in a warm climate such as that of North Africa. - Thus Basilides assumed the existence of two principles, not
**derivable**from each other: Light and Darkness. - The process of transvection is connected with the operations 12; for?k (a m b n) = (ab)kam-kbn-k, (x y x y or S 2 k (a x by) x = 4))k; so also is the polar process, for since f k m-k k k n - k k y = a x by, 4)y = bx by, if we take the k th transvectant of f i x; over 4 k, regarding y,, y 2 as the variables, (f k, 4)y) k (ab) ka x -kb k (f, 15)k; or the k th transvectant of the k th polars, in regard to y, is equal to the kth transvectant of the forms. Moreover, the kth transvectant (ab) k a m-k b: -k is
**derivable**from the kth polar of ax, viz. - Iv.) was the first to remark that the study of covariants may be reduced to the study of their leading coefficients, and that from any relations connecting the latter are immediately
**derivable**the relations connecting the former.

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