CYTOPLASM 



175 



Fig. 108. Cytoplasm of the meristem cells of the root tip in onion. Pictures after different 

 fixation fluids but at the same magnification of 12000 X and 100 kV. (By courtesy of 



L. H. Bretschneider, 1950c). 



coagulate the proteins strongly, such as acetic acid, trichloracetic 

 acid, phosphotungstic acid, alcohol, sublimate or sulphosalicylic 

 acid destroy the fine pattern of cytoplasm by syneresis. Contrary to 

 Wyckoff's statements, osmic acid is found to produce fairly good 

 fixation for animal cells. 



