Buarr.—On the Building Materials of Otago. 115 
purposes, so I am sure the houses in which it is used cannot be very dry. 
No. 12. Yellow fossiliferous stone from the Oamaru district, the precise 
locality unknown. It is referred to by Dr. Hector as a stone largely 
employed by Mr. Hutcheson for burning into lime. From the analysis and 
description given it must be closely allied to the preceding specimen. 
No. 13. Soft fossiliferous stone from the eastern side of Waihola Gorge, 
white in colour, granular in texture, and very absorbent. This is not so 
abundant nor so much used as the hard variety No. 16. 
No. 14. Yellow lithographic stone from the Oamaru district. It has all 
the external appearances of a lithographic stone, but does not exist in large 
quantities ; it is found associated in the same rocks with No. 12. 
No. 15. Grey and yellow travertine limestone of a porous texture from 
the Dunstan Gorge. This stone, which is sometimes called calcareous 
spar, is formed by the deposition of lime held in solution in the water of 
streams and springs. The water acquires the lime in flowing over or 
through rocks containing this mineral, and it is deposited in concretionary 
masses on the banks. ‘Travertine is found in the small creeks that flow 
into the Clutha and Kawarau rivers between Clyde and the Shotover. 
This stone was first burned for lime in 1864, when it was used in the 
masonry of the Gentle Annie Bridge. 
No. 16. White, compact, and very hard stone from Waihola. This is 
the stone from which the well-known Waihola lime is produced. It exists 
in large quantities in available positions on both sides of the gorge through 
which the railway runs. The rock is very much shattered and dislocated, 
few of the horizontal joints being more than six inches apart. This facili- 
tates quarrying and breaking, and to some extent balances the excessive 
hardness, which otherwise would be a great barrier to cheap working. I 
regret that the Waihola limestone cannot be pronounced good, as, from its 
favourable situation, it would be an immense boon to Dunedin and the 
surrounding districts. The limestone contains 94} per cent. of carbonate 
of lime, which is decidedly too rich for building in a damp situation, or 
where strength is required. This, and analysis No. 18, by Dr. Hector, are 
copied from an old advertisement of Dr. Croft’s; they refer to specimens 
taken from the eastern side of the gorge, but I believe the stone now used, 
on the western side, is equally pure with No. 16. Indeed, it was lately 
stated in the papers that it contained 98 per cent. of carbonate of lime, 
which, if correct, makes the matter still worse. 
No. 17. Grey granular stone from Oamaru, found in the same locality 
as Nos. 12 and 14. It contains 2j per cent. less carbonate of lime than the 
former, and is therefore so much better in quality. 
No. 18. Bluish-grey compact stone from Dowling Bay. ‘This is a 
