SO-CALLED PORPHVRITIC GNEISS OF NEW HAMPSHIRE 787 
mechanical origin for the foliation, it would be “ hard to explain 
the escape of the diorite inclusions from the same influence.” 
But if the intrusion of the porphyritic granite followed the period 
of plication and metamorphism, we should expect it to follow 
commonly the structural planes of the preéxisting schists." 
Again referring to our detailed description of contacts in the 
three large areas, it will be seen how commonly this is the case. 
The intrusions are batholitic in their nature. They entered the 
overlying rocks by melting’ their way through the axial zones 
of flexures. It is for this reason that the general distribution of 
these granite bodies is along the strike of terranes in this part 
of New Hampshire. The equivalence of strike and dip in the 
region in the narrow part of the “ Fish-hook” north of Squam 
Lake between the foliated igneous rock and the adjacent schists 
is especially conspicuous.3. Such pronounced apparent conformity 
is probably owing to an exchanging of the usual batholitic form 
of intrusion for a sill or sheet-form. 
Secondly, the study of apophyses will be of much conse- 
quence. If we there see parallelism of the minerals composing 
the intruded tongue to its walls, no matter what the compass- 
direction of the apophysis may be, it is evident that the struc- 
ture cannot be referred to mechanical deformation applied after 
the cooling of the whole intrusive mass. Scheerer early 
*See GUMBEL, op.cit., p. 522, 523, 524. He describes “‘ Lagergranite”’ intruded 
into various schists. It is rather remarkable that his “ Krystallgranit ” of Bavaria does 
not possess a decided flow-structure. The rock is very similar to the porphyritic 
granite otherwise. Cf. also LAwson, Ann. Rep. Geol. Surv. Canada, 1885, CC, p. 73, 
LEHMANN, op. cit., pp. 10, 23; WILLIAMS, G. H., Proc. A. A. A. S., 1887, XXXVI; 
Sect. E, p. 225; CaLLaway, Geol. Mag., 1887, p. 354; Lawson, Ann. Rep. Geol. 
Sury. Canada, 1887-8, F, p. 32; DANzic, Mitth. aus dem Min. Inst. der Univ. Keil 
Bd. I. heft 1, 1888, p.66; BaRLOw, Am. Geol., VI, 1890, pp. 21-22; HARKER and 
MARR, op. cit., p. 284; ADAMS, Jour. of Geol., 1893, p. 334: SMITH W. H. C., Bull. 
Geol. Soc. Am., 1893, p. 338. 
2 From the author’s previous statements there is no evidence that melting took 
place in connection with these intrusions. [ED. 
3See the map of Hunter’s Island by Mr. W. H. C. SMITH, which shows a very 
remarkable parallelism of the foliation in his “ granite gneiss” with the strike of the 
enclosing schists. Ann. Rep. Geol. Surv. Canada, 1890-1. 
4Lawson, The Geology of the Lake of the Woods Region; Ann. Rep. Geol. 
