Geological Surveys of Kentucky and Arkansas. 243 
aman sandstones of the Coal measures an of the 
: cota prevail to the exclusion of either shales or lime- 
<a an which afford the most unproductive soils as yet an- 
ak ee While it is to be expected that rocks of complex origin 
See Ae remains—which are evidences that the rocks them- 
ee eschew ly resulted from the deposition of the washings of 
wt an 5 Bene yield richer soils than sandstones or lime- 
et a o not see that analysis of the soil makes the fact 
soe ie ent Knowledge of the composition of a rock enables 
this Abe es in a general way of the value of the soil, so far as 
peed be = upon chemical characters. We do not see what is 
... y further analyses of the soil. ‘It would appear that the 
= ental processes of deduction or inference may accomplish 
W a “sherestite all that an expensive analysis can show. 
lia ties “a moreover to perceive that analysis shows “ the pecu- 
ai es = the soils derived from the different geological forma- 
ions.” In a cretaceous or limestone soil we of course expect to 
much insoluble silica or silicates, but the quantities of phos- 
B “i acid, potash and sulphuric acid do not appear to bear any 
efinite relation to their geological origin is 1 
i ~i 3 t out its pecu- 
rities further than by an undefinable more or less. Although 
rded in the Arkan- 
composition of the eight soils 
1 rian and of the fourteen from the 
: in regard to the more im- 
portant ingredients: 
Phosphoric Sulphuric _ 
Lower Siluri Carb. lime. Magnesia. acid. acid. Potash. 
Mills ilurian, average of 8 soils, 0°533 0°485 0184. 07052 0-355 
tone grit, “ 14“ 096 o631 0180 0057 0148 
Here we see that the soils of the poo 
nate of lime and potash. 
ra soils of the millstone grit, nine are riche . lin 
© poorest of the Silurian, and five of the former contain more 
On the other hand but 
two of the Silurian soils have higher percentages © eee 
