PLAN OF THE EXPERIMENTS. 8) 
A series of beakers with paraffin partitions was made ready for an 
experiment by rinsing the beakers with water of known resistance, 
which was poured from one beaker into the next until it had passed 
through all. This process was repeated until the resistance of the 
waste water when poured from the last beaker was no lower than at 
the start. 
Se Mg (W Oe) 2 
Sor iz Ze W's 03/2 
Fic. 2._Seedlings of culture 6, experiment C. 
The solutions for each series of cultures were always made from the 
same supply of distilled water, by diluting stock solutions of tenth 
molecular concentration. For measuring, flasks of Jena glass were 
used; for storing water, use was made of glass bottles which had been 
long in service and were very insoluble. At the outset of the w ‘ork it 
was found that peas grew well in water from an automatic labor atory 
still which discharged into a glass container. Comparative experi- 
9427°—Bul. 231— 
