376 Transactions.—Geology. 
difficult to suppose that they could be carried from without, or from a lower 
level, I think it probable that trap-dykes may be found towards the central 
parts of the Tararua Ranges. As I found no trap boulders in the western 
streams, the Otaki and the Waikanae, I should expect to find the trap dykes 
more readily on the eastern and southern sides of the ranges than on the 
western side. 
I found, at Waikekeno, on the Hast Coast, not far from Flat Point, 
reefs of diallage, or bronzite, standing up on the beach. My impression 
was that these formed parts of an east and west dyke, and that this may 
perhaps be traced in the direction of Tararua. 
I found what we may call suspicion of igneous rocks at the Muka-muka 
Rocks ; but of such an undeterminate character that it was difficult to 
decide whether they were igneous or not. 
The above are all the igneous rocks as yet discovered within this Pro- 
vince ; I think it is high time that we should find a few more. Mr. John 
Buchanan lately found an igneous boulder in the clay between Hill and 
Sydney streets ; but there does not seem to be much evidence to show how 
it got there. It may have found its way in former ages from the sources of 
the Hutt River, or it may have been carried by man. 
Along the West Coast we find plenty of igneous boulders brought down 
from Tongariro and Ruapehu by the rivers Whanganui and Wangaehu. 
These boulders are eventually washed out to sea and distributed along the 
coast as far as the Rangitikei, or even farther south. The pumice-stone, 
which is continually floating down the Wanganui and other rivers, is dis- 
tributed over much larger areas. Indeed I suppose there is nothing to 
prevent it making long sea voyages, even to Australia or South America. 
The object of this paper, however, is not to call attention to the volcanic 
products which come from Tongariro, but to point out how to get more 
information as to the trap dykes of the Province. In particular I would 
recommend person in the Wairarapa, of enquiring minds, to look well to 
the valleys of the Ruamahunga, the Waingawa, the Waiohine, and the 
Tauherinikau, examining the banks of these rivers towards their sources. 
An endeavour should also be made to trace the diallage at Waikekino 
inland, and persons living towards the sources of the Hutt River might be 
on the look out for igneous rocks. Any persons ascending the Rangitikei 
River should carefully examine the bars of igneous boulders and endeavour 
to get more information about their locality in situ. 
Sxyce the above paper on this subject was read before the Wellington Philo- 
sophical Society, I have perused in Vol. VII., of the “ Trans. N.Z. Inst.,” 
page 453, a paper by Mr. C. W. Purnell, on The Whanganui Tertiaries. 
