By Edward Solly, Esq. 



In experiments of this kind, considerable variations have been 

 found in the composition of the inorganic substances which plants 

 contain, when thus cultivated under different circumstances ; and 

 therefore we must not at once conclude that such results are 

 rigorously correct. From these, however, and a number of other 

 experiments, I have no doubt that a large and healthy crop does 

 really in proportion exhaust the soil less than a smaller and less 

 flourishing one; nay, even, that under certain circumstances a 

 moderate crop will take more out of a soil, or be more exhausting 

 to it, than a larger one. 



Bedford Row, 

 January , 1845. 



