The microscope; an introduction to microscopic methods and to histology . lar Iris-diaphragm with crosshairs for examining and accurately determining the axial im-ages of small crystals. The iris diaphragm enables the observerto make the field as large or small as desired. A. Lo7igitudinal section. B. Transection, showing the cross lines and the iris dia-phragm with the projecting part at the left, by which the dia-phragm is opened and closed. (Zeiss Catalog). For directions and hints in micro-chemical work and crystallography, consultthe various volumes of the Journal of the Roy. Micr. Soc. ;
The microscope; an introduction to microscopic methods and to histology . lar Iris-diaphragm with crosshairs for examining and accurately determining the axial im-ages of small crystals. The iris diaphragm enables the observerto make the field as large or small as desired. A. Lo7igitudinal section. B. Transection, showing the cross lines and the iris dia-phragm with the projecting part at the left, by which the dia-phragm is opened and closed. (Zeiss Catalog). For directions and hints in micro-chemical work and crystallography, consultthe various volumes of the Journal of the Roy. Micr. Soc. ; Zeitschrift fur physio-logische Chemie, and other chemical journals ; Wormly ; Klement & Renard ;Carpenter-Dallinger ; Hogg ; Behrens, Kossel und Schiefferdecker ; Frey ; Dana,and other works on mineralogy ; Davis. Behrens, T. H.—Anleitung zur micro-chemischen Analyse der wichtigsten organischen Verbindungen. Hamburg,1895-1897. Microchemische Technik, 2d edition, Hamburg, 1900. A manual ofmicrochemical analysis with an introdnctory chapter by J. W. Judd, London,. 158 TEXTILE FIBERS [CH. VI 1894. Especial attention is also called to the articles by Dr. E. M. Chamot in theJournal of Applied Microscopy beginning with vol. ii. p. 502, and continued invol. iii and iv. TEXTILE FIBERS, FOOD AND PHARMACOLOGICAL PRODUCTS § 231. The microscope is coming more and more into use for thedetermination of the character of textile fibers, both in the raw stateand after manufacture. As the textile fibers have distinctive char-acters it is not difficult to determine mixtures in fabrics of variouskinds. The student is advised to study carefully known fibers, as ofcotton, wool, linen, silk, jute, etc., so that he is certain of the appear-ances, and then to determine of what fibers different fabrics are com-posed. He will be astonished at the amount of Alabama wool insupposedly all wool goods. For works and articles upon textile fibers see : Herzfeld, J. Trans-lated by Salter. The technical test
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