248 
names printed in italics indicate minerals which were new to 
science on being found in this region. 
Narsarsuk’s richness in rare minerals is characterized by 
the fact shown in the table that the number of previously un- 
known minerals, which, mainly through Dr. Fıme’s efforts, 
have been found in the very small area of the Narsarsuk 
locality, is no less than thirteen. Compared with this the 
llimausak batholite may be called relatively poor, as in the 
aggregate its numerous and much more thoroughly worked 
localities have only enriched science with eleven new mineral 
species, and some of these are even rather common minerals 
which by a mere chance were first described from Greenland. 
When comparing the list of the Narsarsuk minerals on the 
one side, with that of the minerals occurring inside the Ш- 
mausak batholite on the other, one’s first impression is that 
of a rather considerable dissimilarity. The Narsarsuk list alto- 
gether comprises 41 mineral species, the other list 35, and of 
these only 21, or a little more than half of the number, are 
common to both of the lists. But on closer consideration the 
differences turn out to be of slight importance, when looked 
at from a theoretical point of view. Thus it deserves mention 
that the discrepancies would already be considerably smaller if 
the minerals which have only been observed under the micro- 
scope had been entered in the list. Greater importance must 
be attached to the fact that it does not seem possible out of 
the differences to derive definite rules for the division of the 
minerals in the two lists, but the differences have a rather 
chance character, whilst on the other hand there are important 
points of similarity, especially as regards the presence of less 
common elements. So that Narsarsuk as well as the localities 
in the Ilimausak batholite are characterized by the presence of 
minerals in large quantilies rich in zirconium, titanium, nio- 
bium, and cerium metals, and by the occurrence in smaller 
guantities of beryllium and lithium compounds. Furthermore 
