Abstract
I. “On a Re-determination of the principal Line in the Spectrum of the Nebula in Orion, and on the Character of the Line.” By William Huggins, D.C.L., LL.D., F. R. S., and Mrs. Huggins. Received March 20, 1890. [Publication deferred.] II. “Note on the Photographic Spectrum of the Great Nebula in Orion.” By William Huggins, D.C.L., LL.D., F. R. S., and Mrs. Huggins. Received April 16, 1890. [Publication deferred.] III. “On a new Group of Lines in the Photographic Spectrum of Sirius.” By William Huggins, D.C.L., LL.D., F. R. S., and Mrs. Huggins. Received April 25, 1890. [Publication deferred.]
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