PLANT CELL MEMBRANES 



275 



B 



FiGtTRE 108. X-ray diffraction diagrams of Halicystis. A, untreated; B, stretched 

 75 per cent (fiber axis vertical); C, after purification treatments; D, after treatment 

 with hot glycerin; E, after treatment with hot 0.1 N hydrochloric acid and 1 percent 

 sodium hydroxide; F, for comparison, the x-ray diagram of mercerized cotton treated 

 as in E, 



