72 On the Inorganic Constituents of Plants, 



standard measure full, weighed 4081 grains; hence the bushel 

 full would weigh 58^ lbs. 



13. No Manure. This square, which was reserved as a stand- 

 ard of comparison with the other squares, received no manure 

 whatever. The produce was 



Grain 7 10 10 98 



Straw 30 2 2 3 7 



The proportion of grain to the whole crop therefore was as 

 1885 to 10000. One thousand seeds weighed 596 grains. The 

 standard measure full weighed 4107 grains ; hence the bushel 

 would weigh 58| lbs. 



In the early part of the experiment, shortly after the applica- 

 tion of the manures, the plants in this square looked, if anything, 

 rather better than any of the others ; they seemed larger and fuller, 

 and consequently this square appeared greener than those around 

 it. After a few weeks however many of the squares, and more 

 particularly those which had been treated with ammoniacal 

 manures, far surpassed this in the size and colour of the plants. It 

 was evident, as the wheat came into ear, that the straw was far 

 weaker than that in the neighbouring squares; it was far more 

 easily laid and recovered itself less rapidly than the wheat in other 

 squares, even though the latter were larger and taller plants. On 

 comparing the produce of this square with that of the others, it will 

 be perceived that the quantity of grain is less than in any of the 

 others, with the exception of that manured with Phosphate of 

 Ammonia and Silicate of Potash in No. 2. It is probable, as has 

 already been stated, that a considerable portion of the grain in that 

 square was destroyed by birds. 



14. Silicate of Potash. This square was manured with Silicate 

 of Potash, at the rate of \\ cwt. per acre. The produce was 



