FIGURE II. APPARATUS FOR FREEZING TISSUE 

 QUIRED LOWER THAN -12 TO -15 C. TO KILL. 



THAT RE- 



1. Galvanized iron cylinder to the bottom of which the twigs con- 

 taining buds were fastened; 2 and 3. Galvanized iron cylinders placed 

 one within the other with space between their walls for freezing mixture; 



4. Cylinder to receive 3, allowing space for freezing mixture around 3; 



5. Insulating box filled with sawdust; 6. Wheel operated by electric 

 motor and belt in order to keep (1) turning continuously while freezing; 

 7. Lid for (2). (See page 157.) 



