94 ELEMENTS OF APPLIED MICROSCOPY. 



when produced by accidental breakage, are, of course, 

 absent, since the whole cocoon containing perhaps 500 

 meters of silk is often made up of a single piece. 



12. Analysis of Fabrics. — In the examination of a 

 fabric a sample should be taken 2-3 sq. cm. in size, or 

 large enough to include all the different yarns employed 

 in the pattern. The warp and Ming threads are then 

 separated into their constituents, and one of each kind 

 taken for analysis; sometimes there may be a dozen 

 different yams to examine. Under a low power of the 

 microscope (fifty diameters) the nature of the fibres is 

 determined in the different yams, taken in the proportion 

 in which they occur in the fabric; a rough quantitative 

 analysis may thus be made. 



REFERENCES. 



Bottler. Die animalischen Fasefstoffe. Leipzig, 1902. 

 Bottler. Die vegetabilischen Faserstoffe. Leipzig, 1900. 

 Bowman, F. H. The Structure of the Wool Fibre. Manchester, 



1885. 

 Brooks, C. P. Cotton. New York, 1898. 

 Dodge. Descriptive Catalogue of the Useful Fibre Plants of the 



World. Report No. 9 of the U. S. Department of Agriculture . 



1897. 

 Hannan, W. I. The Textile Fibres of Commerce. London, 1902 

 Hassack, C. Wodurch unterscheiden sich die Textilfasern ? 



Leipzig, 1899. 

 Matthews, J. M. The Textile Fibres New York, 1904. 

 ViGNON, L. La Sole. Paris, 1890. 

 Wilkinson, F. The Study of the Cotton Plant. New York, 1899 



