v. ; 



I IMPOSITION OF SHALES, 



the decomposed mica slates have been already ilms employed. Dr. Jackson, in his New- 

 Hampshire Report, gives the analysis of one which experience 1ms proved valuable in this 

 way by mixing its debris in a compost of peat, lime, etc. 



ANALYSIS BY PR. JACKSON. 



Water 3-G 



Vegetable matter 1 -8 



Silica 79-2 



Peroxide of iron and alumina 5-6 



Potash __ ._ 2-2 



Soda 2-5 



Lime 3-2 



Magnesia 1 -2 



99-3 



The composition of this primary slate may be compared with the taconic slates. We do 

 not, however, mean to convey the impression that slates and shales are definite chemical 

 compounds : and yet there is little doubt but that analysis gives their general constitution, 

 and that they will not be found to vary excessively from the composition which we have 

 found them to possess. 



COMPOSITION OF THE SLATES AND SHALES OF NEW-YORK AND OTHER PLACES. 



NAMES. 



- - *- 



S &3 



V. 



°n a 



V = E 



s a -a 



y - - 



c So 



S-BO 



C 



c — ' 



"35 



a 



01 



3 



— 

 X 

 O 



1 



— 



jfj 



■a ° 



CO 





3-79 



- 

 ■J • 71 ' 



- 

 6-00 

 4*25 



■ - 

 5-56 



■ 



71-62 



■ 



S3 -50 

 81-54 

 18*12 



31 -56 



'20-35 

 1 1 • 53 



12-76 

 16-64 

 12-56 



7-00 

 10-00 

 14-98 



0-99 



.... 



0-10 



1-70 



0-61 

 L-76 



1 

 9-89 



43-06 



0-40 



■ 



0-40 



n-.V.' 

 0-30 



1 



M- |ll 



2-17 



trace, 

 trace. 



trace. 

 0-j 1 



3-32 



1-52 



* 



• 



1 



.,„■ 







Cauda galli rrit 



-ate or shale of the salt group, 



* L<ms m»y be ■* 



t down u 



xttash and the pbosp 



tie* proba 



bly. 









Clays of new-york. 



Clavs are highly important materials in the constitution of soils. They are also im- 

 portant fertilizers, especially when they contain lime, magnesia and potash ; but they are 

 more valuable in pottery and brick making. Some kinds of clay, as is well known, enter 

 into the composition of the finest works of art — the porcelain ware. The expense of 

 moving clay may be considered as the great bar to its use as a fertilizer, and yet its effects 

 are most decided upon all lands which are denominated light. 



The Albany or Tertiary clay extends through the vallies of the Cham plain and the 



