GENERAL MICROSCOPY 





Fig. 4a. SjTithetic fiber structures (from top 

 down): Acetate rayon, phase contrast, cross sec- 

 tion, 450X. Acetate rayon, phase contrast, longi- 

 tudinal, 225X. Cuprammonium raj^on, phase con- 

 trast, longitudinal, 450X. Cuprammonium rayon, 

 phase contrast, longitudinal, 225X. 



360 



Fig. 4b. Synthetic fiber structures (from top 

 down): Viscose rayon, phase contrast, cross sec- 

 tion, 450X. Viscose rayon, phase contrast, longi- 

 tudinal, 225X. Nylon, phase contrast, cross sec- 

 tion, 450X. Nylon, phase contrast, longitudinal, 

 225 X. 



