SECCHI, P.A. Le soleil. 2e éd., rev. & augm. Par., 1875. 2 text-vols. & 1 atlas-vol. xx, 428; viii, 484 pp. W. 13 (all but 1) chromolithogr. plates & 6 double-p. plates to atlas. 8° (2) & sm-4°. Cont. brown h. mor. extra. (W. libr. stamps on ti-pp.).This work was illustrated with magnificent colour plates of the chromosphere and of the various types of prominences. Among those shown were the small flares (now called "spiculae") that he observed in the region of sunspots, converging toward the center of the eruption. These, he noted, became higher, more slender, and extremely luminous at the solar poles, where considerable activity manifested itself even during periods of relative calm on the solar surface. He classified the prominences as "quiescent" and "eruptive" - terminology that is still current'. (DSB).
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