cTlie doctrine of evolution, as applied to 

 igneous roclvs, is not of a kind which can be 

 established by deductive reasoning, but 

 rather by examining in the light of this 

 hypothesis the actual facts of petrology.)) 

 A. Harker, The natural history 

 of igneous rocks. 



IIpepicioBie. 



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1) H. Backlund, Kristalline Gesteine von der Nord- 

 kttste Sibiriens. I. Die Diabase der Kusjkin-Insel. Mem. 

 de I'Acad So. St. Pbg. CI. phys.-math. Serie VIIT. T. 21. 

 JVs 6 (1910). 



2) Eduard v. Toll, Die russische Polarfahrt der 

 «Sarja)> 1900 — 1902. Aus den hinterlassenen Tagebii- 

 cheru, herausgegeben von Baronin Emmy v. Toll. 

 Berlin, 1909. 



3an. <Iiu3.-MaT. Ora. 1 



