188 



I.KSSONS IN ACKKTI/ITKK 



S. Testing Seeds for Germination and Purity 

 Send to the Extension Department of Purdue Agri- 

 cultural College, at Lafayette, Indiana, enclosing 35c, 

 for their collection of mounted weed seeds. This is a 

 very valuable collection, and will serve in a practical 

 lesson. Get samples of clover seed from the stores or 

 from home, and spread out a quantity of the seed on 

 a sheet of white paper. Examine it very carefully with 



FIG. 54 



Courtesy of D. W. Working 



a hand lens, and by the aid of the weed seed collection, 

 pick out the seeds that are not clover. Count out one 

 hundred seeds and determine what per cent of them 

 are weed seeds. Place the remaining clover seeds, from 

 which the weed seeds have been taken, on the moist cloth 

 in the germinating pan, and cover for a few days. Count 

 the number of seeds that failed to germinate, and calcu- 

 late the percentage of good seeds there were in the origi- 

 nal one hundred. At the price paid for the clover seed 



