Wadsworth.] 
268 
[October 19, 
grains. Part of the collection from the Fortieth Parallel was 
in similar boxes, which would account for the presence of the 
grains in the slides examined by Zirkel. Whether the occurrence 
of these grains in the European sections can be accounted for in 
this way or not can not be told ; but one thing is certain, they are 
foreign to the rock slice. 
Since these Hatiyne grains occurred, according to Zirkel, in 
only three specimens, and all these occurrences were rejected by 
me, Mr. Merrill had “ here the elsewhere vainly coveted knowl- 
edge of the precise specimens in question.” But not a word on 
this ! 
Rhyolite. 
Nos. 464 (1799) and 303 (1805), (VI, pp. 152, 194) were collec- 
ted by Mr. James D. Hague in the ; same locality , on the same 
day , and numbered co?isecutively in the field as 2359 and 2360. 
As will be seen above they were not numbered consecutively in the 
Cabinet. Now so far as the writer could find, the hand speci- 
mens and sections are identical, that is as identical as two speci- 
mens of the same rock can be. The only observed difference 
being that the section 303 (1805) is a little thinner than the 
other. Yet while Zirkel describes 464 (1799) as a rhyolite the 
other is said to be a beautiful trachyte ! 
Belonging in the same series with these two rocks are Zirkel’s 
granite-porphyries 120 (1961) and 133 (2054), his trachyte 308 
(1895) and his rhyolites 355 (777), 469 (1918), and 487 (2205), 
(VI, pp. 62, 64, 154, 172, 195, and 200). The last diffiers simply 
in the presence of the augite. 
No. 340 (270) I hold is a much weathered, surface specimen, 
belonging to the andesites. No. 369 (889) is said by Zirkel to 
contain “ very small fragments of strange rhyolitic particles ” (VI, 
p. 174). These fragments the writer takes as andesitic fragments, 
and claims that fragments of andesite can be seen in 351 (558), 
352 (557 ), 362 (852), 370 (892), 371 (893), although Zirkel says 
they are wanting in the last two, and appears not to have seen 
them in the others. 
Other rhyolites containing andesitic fragments are Nos. 416, 
