77 



originating from this rock Nvill probably contain very nearly 

 100 per Ct. of quartz. 



With regard to the felspar, this is found in all the samples 

 in less quantities than the quartz. The ratio between the two 

 minerals is generally between Vs and V's. As might be expected, 

 the proportionately smallest amount of felspar is found in the 

 samples, where part of the material originates from sandstone. 

 In the case of samples, where the quantity of granite and 

 gneiss among the coarser ingredients, far surpasses that of the 

 sediments as is the case in Nos. 30, 32 and 33, the amount 

 of felspar will become much larger, viz. from half the amount 

 of quartz up to about the whole amount. This last ratio, 

 which occurs in No. 33, is very striking and rare, and cannot 

 be explained altogether by the absence of sandstone, but the 

 solid rocks which are found nearest this deposit either on land 

 or at the bottom of the sea, must be very poor in quartz, 

 as would be syenite or hornblende-schist. 



The felspars with distinct microcline structure have no 

 great distribution in the samples, though somewhat more so 

 than in the samples of the Ingo If expedition, where never 

 more than 1 per Ct. was found. Here the microcline is missing 

 in the greater number of the samples, but in a few it is found 

 in comparatively large amount, chiefly in No, 19. This fact 

 might perhaps have been considered accidental, were it not 

 subsequently found to obtain also in samples Nos. 25 — 33 from 

 along the Liverpool Kyst in which about two grains are 

 found in each sample. This circumstance must here be con- 

 nected with the nature of the rocks. 



The total amount of grains of plagioclase is about as large 

 as that of microcline, but they are found to be more evenly 

 dispersed in all the samples. It is strange that none of this 

 mineral is found in the samples consisting mainly of basaltic 

 material. This feature which was also noticed in the samples 

 of the Ingolfexped ition, is caused by the fact that the 



