ON THE SPECTRA OF STARS OF SECCHI'S FOURTH TYPE. I. 87 ON THE INTERPRETATION OF THE TYPICAL SPECTRUM OF THE NEW MINOR CONTRIBUTIONS AND NOTES: J. WILSING The New Algol Variable in Cygnus. +45° 3062, EDWARD C. PICKERING, 126; Note REVIEWS; Die Photographie der Gestirne, DR. J. SCHEINER (F. S.), 132 113 The ASTROPHYSICAL JOURNAL is published monthly except in July and September. Annual subscription, $4.00; foreign, 18 shillings. Wm. Wesley & Son, 28 Essex Street, Strand, London, are sole foreign agents and to them all European subscriptions should be addressed. All papers for publication and correspondence relating to contributions and exchanges should be addressed to George E. Hale, Yerkes Observatory, Williams Bay, Wisconsin, U. S. A. Correspondence relating to subscriptions and advertisements should be addressed to The University of Chicago, University Press Division, Chicago, Ill. [Entered at the Post Office at Chicago, Ill., as second-class matter.] Preliminary Table of Solar Spectrum Wave-Lengths By Henry A. Rowland ROFESSOR ROWLAND'S important TABLE PROFE OF SOLAR SPECTRUM WAVE-LENGTHS, which has been generally adopted by spectroscopists as the standard of reference, was first published in the Astrophysical Journal, beginning with Vol. I, No. 1, January 1895, and continuing to Vol. V, No. 3, March 1897. The Table gives the wavelengths of nearly 20,000 lines, measured from photographs of the solar spectrum made with the concave grating at the Johns Hopkins University. *** The eighteen separate parts, together with a table of corrections and additions, have been reprinted in a single volume of 225 pages, copies of which are now offered for sale at $1.50 each. ALL ORDERS SHOULD BE ADDRESSED TO The Press Division The University of Chicago Astronomical Photograph On account of the frequent requests received at the Yerkes Observatory for lantern slides and prints from astronomical photographs, it has been thought advisable to make provision for supplying the very considerable demand. Mr. G. Willis Ritchey. Optician of the Observatory, who has had wide experience in making and copying astronomical negatives, has undertaken to furnish such photographs at moderate expense. He is prepared to supply lantern slides, transparencies, and paper prints from any of the negatives in the collection of the Yerkes Observatory. Among the subjects available at the present time may be mentioned: Professor Hale's photographs of prominences, faculæ and other solar phenomena, and of stellar spectra; Professor Barnard's portrait-lens photographs of the Milky Way, nebula, comets, and meteors; Professor Burnham's photographs of the Moon, Winter and Summer views of Mt. Hamilton and the Lick Observatory; Mr. Ellerman's photographs of the buildings and instruments of the Yerkes Observatory; and Mr. Ritchey's Kenwood Observatory photographs of the Moon. A more complete list of subjects may be had on application to G. WILLIS RITCHEY, Yerkes Observatory, Williams Bay, Wisconsin, to whom all orders should be addressed. Academy OF of The University of Chicago FFERS to both girls and boys thorough preparation for college and technical school. The curriculum covers four years in each of the courses-classical, literary, and scientific. There is also the Introductory Year for young pupils, which gives thorough training in the elementary English Branches. Morgan Hall for girls, West Hall and East Hall for boys, contain comfortable rooms with equipment modern in all respects. The laboratories are amply furnished with apparatus for Chemistry, Physics, Physiography, and Botany. The library contains four thousand well-selected books for general and special reading, and offers in its reading room the choicest literature of the day. The tennis courts and the athletic field, with space for football and baseball games, track athletics and bicycle riding, give full opportunity and encouragement to outdoor athletics. Gymnasiums in Morgan and East Halls provide for indoor physical training. DURING THE SUMMER, for six weeks, from July I to August 11, courses are offered in Algebra, Geometry, Latin, Greek, French, German, Physics, History, and English. These courses offer an unequaled opportunity (1) for students who desire to make up deficiencies in college preparation or prepare for advanced standing in academic work, and (2) for teachers in high schools and academies to familiarize themselves with new methods or to prepare themselves to teach new subjects. The Autumn Quarter begins September 20. For descriptive circulars address The Dean of the Academy MORGAN PARK, ILLINOIS The Natural History and Scientific Book Circular MATHEMATICAL AND Including Works from the Libraries of REV. A. FREEMAN, M.A., F.R.A.S., A. MARTH, F.R.A.S., and Containing 3000 works (96 pages), including works on the Spectrum, Telescope, Eclipses, Comets, Meteors. To be had on applica tion to WILLIAM WESLEY & SON, Agency of the Smithsonian Institution 28 ESSEX STREET, STRAND, LONDON. COOL RESORTS OF THE NORTH. The Popular Summer Tourist Route is the Grand Trunk Railway, reaching all the famous summer resorts, including Petoskey, Mackinaw, St. Clair Springs, The Muskoka Lakes, Lake of Bays (Highlands of Ontario), Niagara Falls, Thousand Islands, Rapids of the St. Lawrence, White Mountains, Montreal, Saguenay River, and the seashore resorts of the North Atlantic. Also Watkins Glen, Glen Summit, Atlantic City, Asbury Park, and other popular resorts on, and reached by, the Lehigh Valley R. R. Vestibule Train Service. Copies of illustrated literature with full information as to rates, etc., will be sent on application to J. H. Burgis, City Passenger and Ticket Agent, 249 Clark Street, corner Jackson Boulevard, Chicago. IDEAL SUMMER TOURS. The ideal route for summer tourist travel is the Grand Trunk Railway System-reaching directly all the most popular lake, river, mountain, and seashore resorts of the East, including those located on the Lehigh Valley R. R. and direct connections. Vestibule Train Service. Full particulars, and copies of summer tourist literature, on application to J. H. Burgis, City Passenger and Ticket Agent, 249 Clark Street, corner Jackson Boulevard, Chicago. English Studies OF The University of Chicago LATEST ISSUE, Just Published. LEONARD COX, The Arte or Crafte of Rhethoryke, 1530: a Reprint, edited by F. I. CARPENTER, Ph.D. The first English Rhetoric. Price, 50 cents. OTHER NUMBERS JOHN LYDGATE: The Assembly of Gods. E. H. LEWIS: The History of the English Para- F. I. CARPENTER: Metaphor and Simile in the MYRA REYNOLDS: The Treatment of Nature *Sent postpaid on receipt of price. Address THE UNIVERSITY OF CHICAGO PRESS |