308 Minerals from New Holland. 
Australia, between thé years 1818 and 1822, were 
agate, jasper, carnelian, green chalcedony, and helio- 
trope, bearing with them portions of the trap rock, 
but unaccompanied by any of the zeolites.* In de- 
scribing the same class of rocks, Major Mitchell, the 
author of a more recent and fuller journal of obser- 
vations,t has enumerated the following. substances, 
(in addition to the quartzose minerals referred to,) 
forming large veins and masses in the trap; “decom- 
posed feldspar,” “granular feldspar,” “crystals. of 
glassy feldspar,” and “laminated feldspar.” As 
these substances are not very common in secondary 
or basaltic trap, I would respectfully suggest whether 
it is not possible that the author may have mistaken 
their true character, especially as he was obliged to 
pass rapidly from place to place, and does not appear 
to have collected specimens of them for subsequent 
examination. By the unpractised eye, efflorescent 
zeolite might be readily mistaken for decomposed 
feldspar, and other species of zeolite or carbonate of 
lime, confounded with the other varieties of feldspar. 
We may think it highly probable; therefore, that, if 
* See the Appendix to King’s narrative, drawn up by Dr. Fitton. 
Analogous specimens are also described in the journal of M. Péron, 
one of e imn in the French ae to New Holland, at 
about the same 
! Major TE Mitchell, the Surveyor-General of three expeditions, 
into Eastern A Aus tralasia, Australia Felix, and New South ales, 
fitted out under the direction of E British Admiralty. His narra 
in two octavo volumes, with numerous plates and maps, published in 
London, in 1699,1 in its detail ef incidents and discoveries, is one oe dh 
The or 
* has i even made known to us the existence of ihe sister of recent yol- 
canoes and immense mountains of lava, in the interior of that vast 
country. 
