168 



TEXTILE FIBRES. 



rounded and cemented together by a substance resembling gelatine (sericin 

 or silk-gelatine, Schorlemmer). This latter is called "gum" in England 

 and " gres " in France. 



As with other mulberry silks, the two brins polarise light very 

 beautifully when the bave is examined with the microscope and polari- 

 scope, but the surrounding silk gelatine, which forms about 33 per cent?., 

 of the total weight of the bave, has no polarising power. 



Weight of cocoon, ...... 



Dimensions of cocoon, ..... 



Length of bave reeled, ..... 



Weight of bave reeled, 



Titre of bave, milligrammes per 500 metres, . 

 Titre of bave in deniers, ..... 

 Mean diameter of bave, ..... 

 Mean elasticity of bave, .... 



Mean tenacity or strength of bave, . 

 Percentage of silk reeled from the cocoon, 



0727 gramme. 



35 x 19 millimetres. 



615 metres. 



0'190 gramme. 



154 milligrammes. 



2-89. 



00-336 millimetre. 



2077 per cent. 



8 '53 grammes. 



TABLE of the Diameter, Elasticity and Tenacity of the Bave (I.) ten 



metres from the end at the outside of the cocoon ; (II.) at th& 



middle of the cocoon ; and (III.) ten metres from the end at the 

 inside of the cocoon. 



be 



seen from the 

 millimetre 



* 322 ten-thousandths of a millimetre = 7^-9 inch, as will 

 following calculation: T tf,fanr millimetre = 0-000003937 inch, . 

 = 0-001267714 inch or & inch. 



t I.e., 100 inches of bave will stretch or extend, before breaking, to 113'3 inches. 



6 '25 grammes = 0*2204375 oz. avoirdupois, by the following calculation : 

 1 gramme = "03527 oz., and '03527 x 6 '25 = '2204375. 



The diameter and strength of the bave, or natural pair of fibres, are, of course,. 

 double those of the single fibre or brin. 



