1907] 



OSTERHOUT BALANCED SOLUTIONS 



267 



collar. It is then advisable to perforate the bottom of the seed trough 

 by means of a tracing wheel such as is used for patterns. This allows 

 the roots to penetrate the paper freely and without delay. 



Care should be taken that the solution does not cover the seeds. 

 The paper must be spread open at the top so as to allow the air to 

 come into direct contact with the seeds. The micropyle should be in 

 contact with the moist filter paper. 



Careful experiments were made to determine whether the filter 

 paper exerted any influence on the solution (by absorption, etc., 

 or by concentration of the solution about the see'd as the result of 

 evaporation) which might affect the results, but no such influence 



TABLE VI. EQUISETUM 

 All quantities given are cubic centimeters of 3^/160 solutions. 



