89 



ïhyrill a: с = 1,5077 



Elba a: с = 1,5056 



Kangerdluarsuk. ... a: с = 1,5038 



Siorarsiiit a : с = 1,5039 



Herbornseelbach. . . a : с = 1,4849. 



Неге the differences, to a far higher degree than in the 

 preceding cases, correspond to the differences in the manganese 

 content; in both respects the great difference between Siorar- 

 suit and Herbornseelbach is especially strongly pronounced. 

 With regard to Kangerdluarsuk and Siorarsuit the values are 

 in an inverted ratio of what was to be expected; but the dif- 

 ference between the two axial ratios correspond only to a 

 deviation of about 10' in the angle (101):(T01), so that it may 

 be regarded as a casual one. 



The geological observations on the spot given in the present 

 treatise, have been made by Professor N. V. Ussing and the 

 author jointly. With regard to the names of the rocks that are 

 used the reader is referred to N. V. Ussing: Mineralogisk- 

 petrografiske Undersøgelser af Grønlandske Nefelinsyeniter. Medd. 

 om Grønland XIV, 1898 (French resumé p. 403). 



