TYPE PREPARATIONS 71 



Kartokinesis in root of onion, 'Allium cepa.' 



Fixed with chromo-acetic solution. 

 Infiltrate the specimen with paraffin. 

 Cut longitudinal sections '/eooo of an inch in thickness. 

 Mount the sections as directed for the paraffin method. 



Manipulate No. 6. 

 Compare the preparation with Fig. 85. Plate XXIII. 



