126 Prof. Liveing, On the rocks of the Channel Islands. [Nov. 14, 



and is thereby the better able to withstand the action of the 

 waves. 



It is difficult to trace any connection between the rocks of 

 Jersey and those of the other Channel Islands notwithstanding 

 the short distance which separates them. The Jersey syenite 

 on the N. side, nearest Serk, is very unlike the Serk syenite, 

 it is generally more quartzose and contains less hornblende ; in 

 some places the felspar in it is bright red in others nearly white, 

 in some places there is mica, in others none, and in the most 

 inland quarries in St Lawrence's parish it becomes almost a 

 quartzite consisting mainly of quartz with only a small proportion 

 of felspar and little or nothing else. I have not seen any definite 

 signs of bedding in it. On the S. side of the island the syenite 

 consists chiefly of a coarsely crystalline mixture of hornblende 

 and felspar, and may be a highly metamorphosed condition of the 

 Guernsey gneiss ; but no bedding can be traced in it unless some 

 more quartzose veins which extend like thin beds for some 

 distance in it represent different beds of the original deposit. 

 If that be so the bedding is nearly vertical as it is at the S.E. of 

 Guernsey. The boss of fine grained red syenite on which Fort 

 Regent stands has all the appearance of being eruptive, and dykes 

 of similar composition but not quite the same character of crystal- 

 lization, which cut through the coarser syenite of the rising ground 

 on which Victoria College stands, may be connected with it. 

 The rocks on the shore at the Collinette under the fort and 

 all along Greve d'Azette as far as Le Hocq Point in St Clement's 

 Bay, consist of a grey syenitic greenstone consisting of hornblende 

 and felspar, tolerable fine in grain, and no doubt, I think, eruptive. 

 Grey dykes of a similar material but different texture cut through 

 the S. end of the boss of red syenitic rock of Fort Regent, which 

 appears therefore to be of older date and unconnected with the 

 volcanic rocks mentioned hereafter. 



In the view which I have advanced as to the crystallization of 

 granitic rocks there is nothing to limit this kind of metamorphism 

 to aqueous rocks. The resulting character of the rock will be 

 determined by the nature and proportions of the materials of 

 the original rock, and upon their mode of aggregation and upon 

 the permeability of the mass by steam and other gases. My 

 view is supported by the varying character of the crystallization 

 of this greenstone rock ; a character which is common enough 

 in greenstones elsewhere. Here it is mostly somewhat fine 

 grained though the component minerals are quite distinct, but in 

 places where the former existence of rather wide joints is traceable 

 it has become coarsely crystalline, there has been in those places a 

 greater segregation of materials until the crystals have grown 

 to be an inch or more in length. The rock in such places re- 



