Smithsonian Miscellaneous Collections Volume 66 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...to special regions of spectrum, as might be desirable in botanical investigations. While the two strip form is preferable from its greater freedom from temperature disturbances, the single strip form is so much more sensitive that for observations in deep shade, as in a forest, it would be more suitable. As in the case of the silver disk pyrheliometer, we are authorized to state that the Smithsonian Institution will undertake to furnish pyranometers at cost to those who are engaged in investigations which will be greatly promoted by the use of this instrument. The cost cannot yet be exactly estimated, but it will not exceed $150 for the pyranometer itself. This does not, of course, include a galvanometer, ammeter, or batteries. Suitable slide wire resistances will be included. If desired, an equatorial mounting additionally will be be furnished at cost, so that the instrument can be used as a pyrheliometer at right angles to the solar beam. SUMMARY The authors have designed and tested with satisfactory results an instrument for measuring solar and sky radiation by day and terrestrial radiation by night. Two forms of the instrument are described. Either form will be furnished at cost by the Smithsonian Institution to institutions or individuals doing important investigation which will be promoted by using the instrument. CITY OF WASHINGTON PUBLISHED BY THE SMITHSONIAN INSTITUTION MAY. 1916 THREE NEW AFRICAN SHREWS OF THE GENUS CROCIDURA By N. HOLLISTER Since the publication of Mr. Guy Dollman's synopsis of the African shrews of the genus Crocidura, ' the East African specimens of this group contained in the United States National Museum, over 500 in number, have been critically examined. Three hitherto unnamed forms have been found in this...