Hiissakitc. — Kraiis and Rcitiiigcr. 55 
in others thev seemed quite fresh and iindecomposed. Two 
such crystals were examined for sulphuric acid and in both 
instances it was found to be present. These reactions were 
even more distinct than those obtained with the material from 
Bandeira de Mello. The material placed at our disposal was 
insufficient for a complete quantitative analysis. Several other 
Norwegian xenotimes, which are also in the Mineralogical 
jNIuseum at ]\Iunich, were examined but they did not con- 
tain sulphuric acid. These specimens were from Arendal, Ra- 
ade, near Moss, and Httero, and were very much decomposed 
and absolutely opaque, having doubtlessly been formed from 
hupi^akite, as mentioned above. Hence, we believe that from 
what has been said in the foregoing, we are justified in stating 
that if yttrium orthophosphate be called xenotime, then xeno- 
time, in so far as it occurs in crystals, is to be considered as a 
pseudomorph after hussakite. 
Since the publication of this paper in German,* Dr. H. 
Roslerf has shown that hussakite occurs quite frequently as an 
accessory constitutent of granites and quartz porphyries, as 
also of the kaolinites resulting therefrom. Rosier also ob- 
served several crystals of hussakite, which show a distinct 
pleochroism ; w = pale rose to vellow brown, e= brownish 
yellow to gray brown; absorption e>w. 
JNOTE ON THE SO-CALLED BASAL GRANITE OF 
THE YUKON VALLEY 
R. G. McCoNNEM,, Ottawa 
Distribution and o-cncral dcscriftio)t. 
Granite gneisses closely resembling the Laurentian gneiss- 
es of eastern Canada are widely distributed along the upper 
part of the Yukon valley. They have been traced by various 
members of the Canadian and U. S. Surveys from the Nor- 
denskiold river in a northwesterlv direction across the White 
river valley to the Tanana and down this stream to near the 
mouth of Delta river, a total distance of about 380 miles. The 
northwestern boundarv crosses the Yukon from the south a 
*Zeitschr. f. Krystall, 34, 268-277 
\Seues Jahrbiich fiir Miueralogie, GeoJogie, etc., 1902. B. B. XV, 2.^1-393. 
tPublished by permission of the Director of the Geological Survey of Can- 
ada. 
