TE8TS of tup: strength of silk fibres. 71 



rupture is expressed in millimeters in a length of twenty millimeters of 

 fibre, as well as in per cents. No special experiments were made to 



determine the limits of elasticity, and thongb the stretch will vary 

 .somewhat with the length of fibre held between the clamp- of the in- 

 strument, limiting thus the character of the results, yet for tin.- purpose 

 of comparison the figures we have given will prove amply sufficient, 

 and they will clearly show the differences in the quality and value of 

 the samples submitted to examination. 



Other qualities of the fibre and the cocoons have suggested them 

 selves for investigation in the course of this work, but their examina- 

 tion has been precluded by the limited time at our disposal for the 

 present study of this staple. We, therefore, submit these results in the 

 hope that they may serve the ends desired. 



