402 General Notes. [ June, 
where, notwithstanding the varieties, which are indeed number- 
less, but which do not exercise any influence on the fixed charac- 
ters needed for the above classification. 
he order of eruptions is the same not only in Hungary, but 
down southward as far as to the region of the active volcanoes of 
Italy and Greece. Vélain has found it so on the isle of Reunion; 
Professor Heddle Forster informs me, that in the Tertiary volca- 
nos of the Hebrides the first out-flow is a granitic rock with ortho- 
clase, the second an augitic rock with labradorite, the third amyg- 
daloids and basalt with labradorite. . The admirable work just 
issued, “Santorin et ses eruptions,” by Fouqué, confirms this 
order also for that volcanic island; the amphibol-labradorite, more 
acid rocks are older, the augite labradorite-anorthite more basic 
rocks younger. 
There is no doubt, that the trachytes of the Rocky Mountains 
will follow the same law; but as regards the limits of time, the 
cyclus of eruption may exhibit a difference in the relative age. 
It could have begun sooner in one country, and later in another, 
corresponding to distinct volcanic basins, formed in different times. 
As regards the cyclus of trachytic eruptions in Hungary, and in 
the western part of the United States, there are many indications 
that lead me to adopt the opinion that our cyclus antedates yours. 
In order to enable us to pursue more extensive comparative 
studies, descriptions are not sufficient; the objects must be seen 
too, at least samples of rocks should be at our disposal. You are 
very generous and liberal, whenever the interests of science are in 
question ; may I ask you to let me have some of your duplicates 
of typical rocks. 
We have in Hungary a beautiful series of pliocene, miocene 
and eocene rocks, and so the age of eruptions can be well settled. 
Your series seems far from being so clear, and so complete, the 
connection between the trachytic series and the sedimentary for- 
mations is consequently not so evident. 
I should like very much to have samples of your marine clays 
and sands of mioceneand eocene also. Professor Hantken, the di- 
rector of the Hungarian Geological Institut at Budapest, is the spe- 
cialist for the nummulites, orbitoides and Foraminifera generally. 
t would be very good for science, if he could have an opportunity 
to make comparative investigations; while on the other hand, I 
could ascertain whether traces of volcanic sand are contained in 
them.—Dr. Foseph Szabo, Prof. of Min. and Geology in the Uni- 
versity of Budapest. (Extract from a letter to Prof. Hayden) 
a largest neck vertebra of the Camarasaurus supremus, but the 
average length is not very different. The proportions are charac- 
