112 FARM BOILDINGS. 6. 



25 grains of fand and gravel, 



5 grains of filt, 

 64 grains of pure chalk. 



104 grains. 

 From this analyfis it appears, 



1. That the proportion in this cafe (fup- 

 pofing crude limeftone in lumps fit for burn- 

 ing to be of equal weight with fand and 

 gravel) was three meafures of unflaked lime 

 in lumps to two of fcind and gravel. 



2. That the fand and gravel in this cafe 

 had been wajhed-, either by the brook which 

 runs at the foot of the Caftle mound, or 

 more probably, by hand ; the proportion of 

 dirt being fmaller than that which is gene- 

 rally found ^mong dr if i fa}t J. 



^. Ihat the lime had not regained the 

 whole of hsjjxi air. The increafe of weight, 

 which appears in the fynthefis of this experi- 

 ment, is a fufficicnt evidence, were it not 

 corroborated even unto proof by the defi- 

 ciency of air thrown off in the lolution. To 

 try whether the increafe on one hand, and the 

 deficiency on the other, agreed as to quan- 

 tity, I refufpcndcd 50 grains of the chalk 



obtained 



