Astronomers can not bring the phenomena they study into the laboratory or test the behavior of the heavenly bodies under artificial conditions. They have to be satisfied with such opportunities as nature gives, even though she bestows them as meagerly as she does solar eclipses. Consequently, the total eclipse of the forenoon of May 28th has been the object of much preparation. Most of the important astronomical observatories in this country will have parties stationed along the path of the eclipse from New Orleans to Norfolk, Va. Many European parties will observe the eclipse in Portugal, Spain and North Africa. It has been pointed out by Prof. R. W. Wood and Mr. A. L. Rotch[J] that there are several important physical observations to be made apart from the astronomical observations on the sun’s corona described by Professor Bigelow, in the May number of this magazine. Just before and after totality alternate bright and dark bands are observed sweeping across the country. It is hoped that by the coöperation of a number of observers more complete and exact data concerning this phenomena may be gathered and its explanation found. The changes in the wind noted during eclipses will also be observed to ascertain whether the sudden cooling of the atmosphere by the passage of the moon’s shadow is a sufficient explanation of the so-called ‘eclipse wind.’ Those who know nothing about theories of the corona or of the ‘eclipse wind’ will be interested in the more obvious phenomena and in some cases, in the opportunity to take such a photograph as can not be duplicated in this country until 1918. The most favored ones are those who live in the fifty-mile belt of the total eclipse, but the sun will be seen nine tenths covered in the eastern and southern States, and will be six tenths covered to those in the least favorable locality of the United States, the extreme northwest. The proper methods of observing and photographing the corona were described in Professor Bigelow’s article on the eclipse in the May number of the POPULAR SCIENCE MONTHLY. [J] In ‘Science,’ Apr. 27th and May 11th. Transcribers’ Notes Punctuation, hyphenation, and spelling were made consistent when a predominant preference was found in this book; otherwise they were not changed. Simple typographical errors were corrected; occasional unbalanced quotation marks retained. Ambiguous hyphens at the ends of lines were retained. Page 162: “ominum gatherum” likely is a misprint for “omnium gatherum”. Page 167: “resistent” was printed that way twice in this article. In a different article, it was twice printed “resistant”. Page 207: Unmatched closing quotation mark deleted after “from other men.” Page 211: “corrolary” was printed that way. Page 214: “calcium carbid” was printed that way. Page 220: The first occurrence of “American Museum of Natural History” was printed without the “of”; the second with it.