The Laboratory 



87 



Fig. 30. Procedure employed in cutting roots within their flasks, 

 preparatory to transferring them to fresh nutrient. 



Fig. 31. Distributing nutrient to flasks. The tray to the opera- 

 tor's left contains empty flasks which are filled from a semi-auto- 

 matic burette and transferred to the tray to the right, to be plugged, 

 capped, and sterilized. 



