81 CELL CONTENTS. 



OBSERVE : 1. Sphaerocrystals of various sizes, adhering to 

 the cell walls. 



The radial and concentric stratification of the crystal ; seen 

 more clearly by the application of nitric acid. 



Remove the alcohol by water and note that after a little time 

 all of the crystals have been dissolved. Sulphuric acid also dis- 

 solves the crystals. Ziinmermann's Bot. Microtechnique, p. 78; 

 Vines Text Book of Bot., p. 114; Strasburger, 'p. 51; Comptes 

 Rendus cxvi (1893), pp. 514-17. 



