40 Canadian Record of Science.. 



tion." J. Pr. L. Hausmann 1 also remarks that they " are 

 without doubt segregations, not filled cracks, and conse- 

 quently of on origin contemporaneous with the formation of 

 the whole syenite mass." Similar opinions were held with 

 respect to the Arendal granite pegmatite veins by (* . 

 Kreischer, 2 and for those of Konigshain in Obcrlausitz, by 

 G. Woitschach. 3 The latter remarks concerning the " segre- 

 gations" of pegmatite granite : " Actual veins of this kind 

 were never observed ; the masses appear bounded on all 

 sides by normal granite, and must be considered as local 

 variations of the same whose origin was contemporaneous 

 with that of the main mass," etc. He remarks further of 

 the granite of Konigshain, that it contains a number of 

 cavities which, analogous to those occurring at Elba and 

 Striegau, are lined with crystallized minerals, and adds : 

 "An essential difference between pegmatite and these 

 cavities does not exist ; they are distinguished only by the 

 accidental method of formation." E. Kalkowsky, 4 although 

 he expresses himself rather indefinitely, also seems to re- 

 gard the pegmatite veins in the Saxon granulite (which he 

 connects with the Mittwida granite) as " segregation veins," 

 (Ausscheidungstriimer). 



H. Kosenbusch, in a very sagacious way, connects the 

 formation of the pegmatite veins with the fine-drusy, mia- 

 rolitic structure of the granite rock. After he has described 5 

 the fresh feldspar, quartz, etc., formed as " filling" of the 

 miarolitic druses, and has delineated their graphic-granite 

 structure, he proceeds : " If by the crystallization of the rock 

 there had been formed, instead of innumerable small miaro- 

 litic cells, single larger druses and vein-like cavities, in the 

 case of these a gradual secondary filling-up with feldspar 

 and quartz, as well as with other minerals, could take place, 



1 Bemerk. ub. d. Zirkonsyenit, 1. c, p. 8 (Sep.-Abdr.) ; see also Keise durch 

 Scandinavien, 2, 106. 



2 Neues. Jahrb. f. Min. 1869, p. 209. 



:i " Das Granitgebirge von Konigshain," Abhandl. d. Naturf. Gesellsch. zu 

 Gorlitz, 1881, 17, 10 (Sep.-Abdr.). 



4 " Ueberden Ursprung d. granitischen Gange im Granulit in Sachsen," Zeit- 

 schr. d. d. geol. Ges. 1881, 33, 653. 



6 Mikr. Phys. d. mass. Gest., 2 Ausg., 2, 39. 



