BULLETIN OF THE BUSSEY INSTITUTION. 59 
jars, were charged as follows: The first set with 525 grammes of 
ashes from hard white-ash anthracite coal from Pennsylvania. This 
coal was taken from a different lot from that which furnished the 
ashes used in the experiments of Series A and B. It was burned, 
moreover, in a much shallower furnace, and one surrounded upon all 
sides by a “ water-back” or jacket through which water continually 
circulated, so that much of the ashes may never have been subjected 
to so high a temperature as that to which the greater part of the 
ashes used in Series A and B were inevitably exposed. Some por- 
tions of these ashes from the shallow furnace, and many of the frag- 
ments of unburnt coal which were mixed with them, undoubtedly 
came through the grate bars without ever having been even strongly 
heated. 
The second set of jars received 1,370 grammes of pit-sand similar 
to that used in Series C. The third set. was charged with 1,350 
grammes of the pure white quartz sand of Berkshire County, in this 
State, such as is used at the flint-glass works of this vicinity. The 
fourth set was filled with 1,210 grammes of ‘ West Jersey Green 
Sand Marl” from New Jersey. 
Three buckwheats seeds were planted in each jar on the 11th of 
January, 1873, and in due course the jars were watered with weak 
solutions of various chemicals, applied either singly or-admixed, as 
in Series B and C. The kinds and strengths of these solutions will 
appear from the following list.. 
Sulphate of magnesia, sulphate of lime, chloride of potassium, and 
phosphate of potash, each 0.25 gramme to the litre. 
Nitrate of lime 1 gramme to the litre, nitrate of potash 1.25 
gramme to the litre, and nitrate of ammonia 0.5 gramme to the litre. 
The three nitrogenized solutions were made of such strength that a 
litre of each of them contained as much nitrdgen as was contained in 
a litre of the nitrate of lime solution employed in Series B and C. 
The results of these experiments are given in the following tables : — 
