368 Note» -on Fro/emor Keilhaii*ii Faper on Granite, i^c, 



M;as formed by crystallization at the same time with the stratified rocks, 

 it might perhaps be pretended, with respect to the ramifications in the 

 primary rock, that these were upfillings of the vein-fissures then open 

 in the basis of the new formation." P. 86, I. 30. " It is not a mere 

 conjecture, but a fact, that the presence of the great porphyry forma- 

 tion depends entirely on this sandstone, and, indeed, there is a constant re- 

 lation observed between the existence of this sandstone and the points 



where the great porph3T3' formation has appeared P. 87, 



*. 10. " When we treated of the coal-formation (in a previous part of 

 the lectures), we hesitated to assert, in opposition to the authority of 

 modern geologists, a constant connection between the existence of these 

 porphyries and certain beds which are connected with the coal-for- 

 mation ; and we did not venture to admit a connection of formation 

 between the abnormal mass and the strata in question." P. 88, 1. 24, 

 " That the larger masses are more crystalline than the smaller, accords 

 perfectly well with vulcanism ; but certainly this is not the case with the 

 other circumstances I have just mentioned; it undoubtedly results from 

 them, that these remarkable abnormal rocks which present themselves un- 

 der the form of quartzites, syenites, or true eurite-porphj'ries, cannot in 

 any manner be considered as a mere accessorj"^ and altogether foreign 

 part of our formation, which might appear equally well in any other 

 place, and even bej'ond the limits of that formation, but that, on the con- 

 trary, we should regard them as belonging to it in a peculiar manner; 

 nn opinion which prevents us from admitting the idea that they only oc- 

 cupy by accident the places where we find them." P. 92, 1. 14, " In 

 following up this subject, the first thing that presents itself to us, is the 

 well-known phenomenon of the crystallization of substances which occur 

 in the form of vapour or gas ; but it is beyond this only that a dark re- 

 gion lies before us, into which, however, we must also penetrate." P. 94, 

 1. 14. " It is quite evident that we must anticipate chemistry wlien we 

 are forced to rest on facts like these quoted, but we could not expect that 

 that science should condescend to give ^ the studj' of these phenomena 

 all the attention which they require ; in order, therefore, to render them 

 available, we must take them as they are. The little that they tell us 

 regarding the qualities of bodies, and the operations by which, in nature, 

 the production of crystals and of mineral species is effected, is in fact the 

 utmost that we can find where a basis is to be sought for our new theory, 

 if, with this object in view, we do not wish to go bej'ond direct know- 

 ledge." (From the inquiry proposed at p. 92, as to whether there does 

 not exist other modes than those admitted by the Vulcanlsts and Nep- 

 tunists by which cr^-stals are produced, it has resulted that there are two 

 others: 1. solidification in crystals of substances in the state of an elastic 

 fluid ; 2. crystallization of solid masses and in solid masses, &c., t. e. by 

 that method regarding which we yet^know so very little. For the sake of 

 clearness, this little resume should have been inserted in the text, for. 

 Without it, there may be difficulty in perceiving; that what follows is. «t- 



