370 Notes on Professor Keilhaii's Paper on Granite, Jjcc. 



does not prevent the movement or ^nobility of S2tbstance3, I said, it is then 

 possible that iu the solidified portions of the globe verj' essential changes 

 may have taken place, and still take place even' day, by means of this 

 property of motion which substances possess in their rigid masses. And I 

 added, ought Ave not iu this case to conclude in favour of the reality from 

 the possibility? Certainly, iu modern geology, much less value is at- 

 tached than formerly to the unfounded supposition," &c 



P. 98, 1. 20; "A continued study has only confirmed my views on this 

 subject, and I was constantly brought back to the application of this 

 truth, which seems to me fundamental in the science, not only by the 

 attentive examination of the mineral masses which form rocks, but also 

 by the consideration of the productions which occur in particular reposi- 

 tories, in veins, beds, and nodules, and also by that of imbedded and 

 disseminated minerals." — P. 99, 1. 4 ; " We shall therefore endeavour to 

 avail ourselves, as much as possible, of the observations mentioned. 

 When we Eimply consider the facts on which they are founded, that is 

 ■without attempting to penetrate to their very foundations, but regarding 

 them only as mere phenomena, these facts lead to some general views 

 which ought, at least provisionally, to be admitted as just;" 1. 17, for 

 metnstomatoses read metasonuitoses. P. 100, 1. 31. " It is upon the 

 same views, and in general from those which result from observations 

 on the developments which take place in solid bodies, that we must, 

 I believe, found our ideas of the formation of granite and the other 

 massive rocks of which we are treating. We must return to the same 

 source when we shall afterwards discuss the origin of gneiss, mica-slate, 

 or generally of the crystalline slates ; nay, the same leading idea will 

 afterwards be made to apply to claj'-slate, and most other non-crystalline 

 rocks ; for, when the subject is well considered, it is certain that these 

 last themselves, regarding whose mode of formation so little trouble has 

 been taken, have not been deposited just as we find them at present. 

 But let us return to the unstratified cr^-stalline rocks, which should oc- 

 cupy us at present, and particularly to those which we have observed in 

 our transition series (formation intcrmediaire). In applying to them the 

 results of the considerations which we have been considering, it will be 

 well for us to attend at the same time to some other products of the same 

 formation, whose lormation is connected with that of the massive rocks." 

 Vol. XXV. p. 267, 1. 32, *' In fact, the process which must take place, when 

 a mass in a state of fusion becomes solidified, has not been minutely con- 

 sidered (for example, when such a mass is about to become granite). If 

 it were to be attended to a little less superficially, it would probably be 

 found, that the investigator would be led to embrace views but little 

 different from those to which the preceding reflections have brought us, 

 and the means which nature employs for the transformation of an amor- 

 phous and homogeneous mass, which presents itself after that transformation, 

 under a crystalline and heterogeneous aspect, would be considered as iden- 

 tical, whether the mass may be what we would term solid, or pasty, ot 

 entirely liquid. Probably it is not too rash to suppose, that it will be 



