FOR WAGGONER’S BIOLOGY 
95 
IV 
STARCH PASTE 
To prepare starch paste mix 1 gm. of powdered starch with a 
little cold H 2 O. Add this mixture, drop by drop, to 100 cc. of 
boiling H 2 O, stirring all the time. Continue to boil for several 
minutes. This makes a thin starch paste suitable for use in the 
experiments concerned with tests for nutrients and for the action 
of enzymes. 
V 
FORMALIN AS A PRESERVATIVE 
To preserve material for labt)ratory use, a solution of one part 
commercial formalin to nine or ten parts H 2 O may be used. 
