334 
Ramsay, in 1899, discusses the problem of the lujavritie 
structure in some detail’. He points out the difficulty con- 
nected with the interpretation of this structure, and expresses 
the opinion that ‘it must be referred to a slow cooling and a 
quiet crystallization of the magma’. He opposes the view held 
by BroGGer and others, that the structure is an ordinary flow 
structure. His objections are mainly based upon the assump- 
tion that the schistosity, if produced by magmatic movements, 
must be connected with the intrusion of the magma, and are 
apparently of no effect if the movements have been produced 
in the manner explained above. 
It appears, therefore, that the schistose structure of lu- 
javrites in Greenland and elsewhere may be explained as a true 
flow structure produced under peculiar conditions. 
CHEMICAL COMPOSITION OF THE ILIMAUSAK 
AND IGALIKO ROCKS. 
The analyses of igneous rocks from the country around 
Julianehaab have been given and discussed separately in the 
chapters dealing with the petrography of the country. For 
convenient reference all analyses are grouped in one table at 
the end of the volume, and at this place the main features 
characterizing the igneous complexes will be briefly considered 
from a chemical standpoint. 
Common characters. — The igneous rocks of Ilimausak and 
Igaliko belonging to a single cycle of igneous activity (probably 
of late Devonian date) exhibit certain common characters which 
may be summarized thus: — 
(1) All belong to the alkali family of rocks. 
1 Fennia XV, No. 2, р. 11. 
