Page:Transactions and proceedings of the New Zealand Institute (IA transactionsproc41newz).pdf/133

Rh The photographs taken by Jr. Browne at Laster, 1907, and by Mr. Cockayze this year, do not show any material change as a result of the rather violent activity that was in progress when the pliotograph (Plate VI) was taken. It appears, however, ihat the extension of the deep cavity westward and northward has been continued to a slighi extent, In all my visits to the crater the escape of steam from it has been much more voluminous than is shown in the photograph of the crater taken by Mr. Cockayne.* There is one point about which I am not certain. A small mud-crater is to be seen on the cast side of the big explosion-cavity. When it was formed I do not know; it certainly was not there in 1891. It may have been formed at the same time that the explosion-cavity was blown out, though I have no pote of its presence in 1893.

To sum up :-

1. The form of the crater appears to have been very different in 1839 and 1852 from its present shape.

2. In 1891 the door was level, except where the worth-west craker was situated, which was then the most active spot.

3. In 1893 the north-west crater was less active, and the explosion- cavity was of small diameter near the middle of the crater, and was steaminy vigorously.

4. Since that time the explosion-cavity has extended westwards and northwards, anel the activity of the north-irest crater bas dwindled.

5. No escape of luva has occurred within historic times.

6. The main-erater walls Lave not changed since 1891.

EXPLAIXITION OF PLATES V-VII.

FLATE 9. Fix l. Crater of Ngaurubne ia 1891. Pig. 2. The same in 1907. Fiy. 3. The same in 1906. I'LATE Vi. per part of cone of Agathoc. at 31.1.11th March, 1947. sonth-east; distance, fire miles. TLAT VIT. Highest point of crater-wall of Nghurnhoe--the soath-east side. Photo taken from the

ART. IX.- Additions to the list of Ver Zonlund Jimernis.

By Dr. P. MARSHALL M.A., D.Sc., F.G.S., University of Otago. Head before the Olso Insiitair. 10th Yorumber. Bos. Is the rear 1890 So James Hector compiled a list of New Zealand minerals for inchision in the " Transactions of the Australasian Association for the Advatement of Frienre" (vol. ii, 1890). Siner that time a large number of papers have been written by a variety of authors on New Zealand geology. In these papers many references have been made to minerals that are not included in Ni: James Hector's list. In the present paper these references
 * Toumuriro National Park": L. Corknyne. Parliamentary pper C.-11, 1909.