330 The Wohurn Pot-Culture Experhnents, 11)10-11-12. 



Examining these results it will l)e seen that they are 

 extremelj' consistent, and tell one and the same story for all 

 the three varieties. As the amount of magnesia is increased 

 so is the produce, alike of corn and straw, increased, and there 

 would seem to be a clear advantage froui adding magnesia, so 

 long as this does not exceed the lime in amount. The grain 

 when examined was also found to be more glutinous as more 

 magnesia w^as used, and the determinations of nitrogen in the 

 grain, given in the table, show this to be the case. It is not 

 maintained, it should be said, that this is the same as what the 

 miller or the baker calls " strength." There was, as explained, 

 not sufficient of the produce to make a l)aker'8 test, and the 

 nitrogen figures as recorded must only be taken as an indication 

 of the direction in which the results tend. An examination of 

 the grain of the various lots clearly showed that this had 

 undergone considerable modification, the corn from the soil 

 with the higher magnesia in it being harder and more 

 translucent than that from the natural soil. This was not 

 confined to one variety, but was common to all three. One 

 cannot, therefore, but come to the conclusion from these 

 experiments that the presence of magnesia in the soil has 

 had a marked influence in modifying the character of the 

 grain. 



In 1911 the question was further examined, the plan 

 resolved on being to take the produce of 1910 affected, as 

 it had already been, by the magnesia added to the soil, and 

 to sow it again under similar influences for a secoml year. 

 Only one variety, the "8 B " (of Prof. Biffen), was available 

 but this was sown in December, lit 10, in fresh soil of similar 



