312 SCIENCE AND FRUIT GROWING 



considerably, by the growth of plants. But the case is evidently 

 one of great complexity, and both from this work, and from 

 all the facts discussed above, it is abundantly clear that we are 

 as yet only on the fringe of an explanation of the changes 

 accompanying plant-growth, and that very much work remains 

 to be done before a true insight can be obtained into the 

 reciprocal effect of plant and soil on each other. 



