24 



The two series of composite samples analyzed veiy much ahke, 

 although the variations between the two analyses from the same plat 

 are greater, in many cases, than the variations between the analyses 

 from any two plats m the same series. This is to be expected, as the 

 six crops were not all grown at the same time. 



The effect of the carbonate of lime in the soil upon the ash compo- 

 sition of the plant is shown in Table XVI, where all percentages are 

 expressed relative to the percentages present in the plants from 

 Plat I. The results in Table XVI are the average of the two analyses 

 given in Table XV. 



Table XVI. — Relative ash<oinpos%lion of radishes from dijferent plats. 

 LE.WES. 



Relative composition of ash (per- 

 centages in plants from Plat 1=100). 



Relative amount ash constituents in dry substance 

 (amounts present in plants from Plat 1 = 100). 



The amount of lime in the dry substance of the leaves increased 

 about 20 per cent in Plats II, III, and IV. Sihca and iron in the dry 

 substance of the leaves decreased irregularly from Plats I to IV, while 

 the magnesia decreased regularly. In the dry substance of the roots 

 there was an appreciable increase in lime in Plat II only; magnesia 

 and iron decreased regularly from Plats I to IV. The amount of ash 

 in the leaves increased shghtly from Plats I to IV. The composition 

 of the ash in leaves and roots showed about the same variations as 

 the ash constituents in the dry substance. 



Taking the plant as a whole Geaves and roots together), it appears 

 that the plants grown on the plats with CaCOg differed from the check 

 plants in containing about 12 per cent more lime, 7 to 17 per cent less 

 magnesia, and 15 to 35 per cent less iron. 



