26 



Crop A ran somewhat higher in sihca and total ash than the combined 

 crops B, C, and D, otherwise there was Uttle difference between the 

 two analyses in respect to the amount of ash constituents in the dry 

 substance of the leaves. Considering the percentage composition of 

 the ash, crop A ran higher in sihca, while tlie combined crops B, C, 

 and D, were higher in hme and magnesia. 



The average relative composition of the leaves from the different 

 plats is given in Table XIX. In calculating the average of the two 

 analyses given in Table XVIII three times the value was given to 

 analysis B, C, and D, that was given to analysis A, so Table XIX 

 represents the average relative composition of four crops from the 

 different plats. 



The amount of the different ash constituents in the dry substance 

 of the plant appears to be unaffected by the carbonate of lime in 

 the soil; only in the plants from Plat II is there an increase in the 

 amount of lime. The composition of the ash also appears to have 

 been influenced very little by the character of the soil. In Plats 

 II and III, but not in Plat IV, the percentage of Ume in the ash of 

 the plants was increased by about 10 per cent. The ash of the 

 plants from Plat III ran a little higher in all the elements except 

 sihca. On the whole the carbonate of lime in the soil does not appear 

 to have altered the ash composition of cane leaves in any regular way. 



SWEET CASSAVA. 



Sweet cassava, when harvested at the end of 122 days, was growing 

 vigorously and had formed some fleshy roots. Six crops were grown 

 at cUfferent seasons of different years. While the plants in Plat IV 

 were never chlorotic, at times their leaves were noticealily lighter 

 in color than those of the plants in Plats I and 11. (PI. II.) 



Koots, leaves, and stalks were weighed separately, but only the 

 total weight of the crop is given in Ta]:)le XX, as the relative propor- 

 tions of roots, stalks, and leaves did not vary with the different soils. 



