i 7 8 ANALYSIS OF LITHOMARGE* 



this name of Lithomargae docs not feem to be art 

 important diflinclion. The character of this 

 fpecies bears a (Irong refemblance to the zeolite ; 

 nor do they diller in compolition, except in the 

 Jmall portion of magncfia which the zeolite wants. 

 There is fome analogy between it and marles 

 alfo. But in the lithomarge the combination of 

 the different principles is not merely mechanical, 

 as in the marie, which eftervefces more readily 

 with acids, although it contain lefs calcareous 

 and magnefutn earth than the lithomarge now 

 under coniiderution. 



Notwithllanding, in the varieties examined, 

 the great eft proportion of argillaceous earth does 

 not equal a fourth part of their weight, and that 

 the filiccous earth generally exceeds the half; yet 

 neither Cronlledt, nor any other mineralogill, 

 have thought proper to refer them underthe head 

 liliceous; and for the very bell reafon; as fuch 

 is the inteniity and prevailing quality of clay, 

 that though it were ihll in a much lefs proper- 

 tion, it would yet determine the charader of 

 the whole mafs. 



As the clay of Hampfhire is muchufed in the 

 trade of fullers, we may learn from this analylis- 

 what are the properties it is required to pofleft. 

 In the operation of fulling, twothingschiefly are 

 necefiary ; firfl, the witfningaway all impurities \ 

 and fecondly, the thickening and confolidating 



at 



