GROWTH OF BEANS IN EXPERIMENTAL SOIL. 115 



The following table shows the crops yielded by all 

 four pots, with the number and weight of the seeds : 



What strikes us here at once is the great difference 

 in the number and weight of the seeds respectively 

 gathered from the several pots. The soil richer in 

 nutritive substances yielded not only more, but larger 

 and heavier seeds, the average weight in milligrammes 

 being respectively : 



Of the seeds of the plants grown in the first pot 

 (pure turf), seven weighed no more than five of the 

 beans originally sown ; whereas those of -the plants 

 grown in the saturated turf weighed each l-5th more 

 than one of the seed-beans. 



If we compare the crop of seeds with the quantity 

 of nutritive substances contained in the turf of the four 

 pots, we see at once what influence the form and distri- 

 bution of the nutritive substances have exercised upon 

 their nutritive power. 



