%62 
Hints for the Formation of 
sooner. The trials which I continue to make in regard to * 
the use of gall nuts in dyeing Adrianople red, induce me 
to believe that it is by the formation of a gallate of alu- 
mine that alumine is fixed upon cotton, that the gallic acid 
may be afterwards separated by an alkaline carbonate 
before the process of dyeing is begun. When I have ac- 
quired certain information on this subject, I shall not fail 
to publish the result. 
No. 35. 
dlgenda, or a Collection of Observations and Researches . 
the Results of which may serve as the fou ndation for a 
Theory of the Barth. By M. de Saussure. 
(Continued from page 208.) 
CHAPTER XV. 
Observations to be made on primitive mountains . 
1. WHETHER there be any exception to the gene- 
rally received opinion, that, in primitive mountains, no 
vestiges are discovered of organised bodies. 
2. Whether it be true that in these mountains no indh 
cations are found of bitumen or marine salt. 
3. To endeavour to determine the respective age% of 
the different kinds of primitive mountains; both com- 
pound, such as granite, porphyry, gneiss ; and simple, 
as slate, serpentine, and primitive calcareous. 
4. Whether, in particular, it be certain that granite is 
the most ancient stone of all those which form the outer 
crust of our globe, so that it is never found placed above 
(superpose) any other kind of stone. 
