Skey. — On the Mineral Wato's of New Zealand. 427 



It should be stated here that the amount of carbouic acid given in the 

 above analysis is merely computed, sufficient of it being taken to make up 

 all the substances in union with it to bi-carbonates. Besides the acid 

 necessary for this, there is a considerable quantity present in a free state: 

 indeed, the water is, I believe, described as effervescing strongly when 

 escaping from the spring. 



This Avater is clear and sparkling, caustic as before observed, and has a 

 specific gravity of 1006-46 at 60° Fahr. 



Exposed to the atmosphere a crystalline precipitate formed, consisting 

 principally of carbonate of hme, the following being its approximate com- 

 position : — 



CarBonate of lime .. .. .. .. .. 81-21 



„ magnesia . . . . . . . . . . 18-79 



L.-on oxide . . . . . . . . . . . . traces 



100-00 



I append an excellent and very elaborate description which has been 

 published of this mineral spring : — 



"About a mile and a-lialf from Bay's, there may be seen an interesting 

 mineral spring, which will well repay a visit. As we are not aware that it 

 has ever been described, we devoted some time to its examination. On 

 approachiag the spring from Say's, a white, somewhat elevated patch 

 strikes the eye. At a distance of half a mile it is very conspicuous in the 

 surrounding fern and swampy land, and looks not unlike a deposit of guano 

 as seen sometimes on the coast. Turning aside to inspect, a few yards 

 through the fern on the left-hand side of the track, we found ourselves on a 

 hard, whitish, oval-shaped mound of calcareous matter, about fifty feet in 

 length and thhty-five feet wide, and of generally level surface. The 

 western end of the ellipse slopes gently away to some low, boggy land, 

 green with raupo, toetoe, and convolvulus. The other end is level with 

 the harder and higher ferny surface of a low, flat s]pur from the neighbour- 

 ing ranges, and at this end is an oval-shaped hole, about six feet by five, 

 and three-and-a-half feet deep, but contracting regularly downwards like a 

 funnel. The bottom is a mere tube of about three inches in diameter, 

 down which a stick was thrust to a depth of eight feet from the surface. 

 This hole is full of cold, clear, bubbling water, which overflows by a gutter 

 about two inches deep and three inches wide, sunk in the hard crust of the 

 mound and coursing outwards to its western extremity, where the small rill 

 of water loses itself in the swamp below. Bubbles of gas continuously 

 ascend in three or four columns from the bottom of the hole, and burst on 

 the surface in rapid succession. The water has the pleasant, brisk, and 



