THE PHYSICAL CHEMISTRY OF THE CRYSTALLIZATION 
AND MAGMATIC DIFFERENTIATION 
OF IGNEOUS ROCKS 
J. H. L. VOGT 
TRONDHJEM, NORWAY 
INTRODUCTION 
In a later paper of this treatise (I-IV) are given the physico- 
chemical laws which govern the crystallization of igneous rocks. 
Subsequently, it will be shown that the same laws can be applied to 
the explanation of the chemical composition of igneous rocks, and 
consequently also of magmatic differentiation. 
As I shall often refer to my earlier publications on the problems 
here discussed, I give a list of those of most importance: 
““Studier over slagger,’”’ Svenska Vet.-Akad. Handl., 1884. (Stockholm, 
1885.) 
“‘Beitrige zur Kenntnis der Gesetze der Mineralbildung in Schmelzmassen 
und Ergussgesteinen,” Archiv for Mathem. og Naturv., Vols. 13 and 14. (Kristia- 
nia, 1888-90.) 
“Die Silikatschmelzlésungen,” I and II. Kristiania Videnskabs-Selskap, 
1903, 1904. 
“Physikalisch-chemische Gesetze der Krystallisationsfolge in Eruptivge- 
steinen,”’ Tschermaks min. und petrogr. Mitt., Vols. SOM Coe 5), XXV (1906), 
and XXVII (1908). 
“Uber anchi-monomineralische und anchi-eutektische Eruptivgesteine,” 
Kristiania Vid.-Selsk., 1908. 
“On Labradorite-Norite with Porphyritic Labradorite-Crystals: a Contri- 
bution to the Study of the ““Gabbroidal Eutectic,” Quart. Jour. Geol. Soc., 1909. 
“Uber das Spinell: Magnetit-Eutektikum,” Kristiania Vid.-Selsk., 1910. 
“Die Sulfid: Silikatschmelzlésungen” (a review, 97 pages); Norsk Geologiee 
Tidsskrift (Kristiania), IV (1917). 
“Die Sulfid: Silikatschmelzlésungen. Part I. Die Sulfidschmelzen und 
die Sulfid: Silikatschmelzen.” Kvristiania Vid.-Selsk., 1919. Later will appear 
Part II. Die Nickel-Magnetkies-Lagerstatten. 
For geological surveying, chemical analysis, photographs, etc., for this 
publication I have had contribution from Den Tekniske Hoiskoles Fond 
(The Foundation of the Technical University of Norway). 
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