512 Transactions.—Geology. 
the Lyttelton end, the lava-streams, when first passed through, were so wet 
that the workmen could scarcely continue the work. In these streams all 
the cellular cavities were either lined with spherosiderite or filled with calcite. 
Sixteen chains from the Lyttelton entrance, in the agglomerate bed No. 
228, and from a fissure reaching from the roof of the tunnel, a copious 
spring flows Which has a constant temperature of 65-20 degrees Fahrenheit, 
consequently 12-20 degrees above the mean temperature of Christehurch— 
about 53 degrees. Several eels have been caught near this spring in the 
drain which runs from here to the mouth of the tunnel. There being no 
conneetion with any other watercourse, these eels must have ascended by 
the spring; they belong to the species Anguilla aucklandii, Rich., and have 
properly developed eyes. During the construction of the tunnel it was 
frequently observed in the north, or Heathcote end, that the water rose in 
the floor before a south-west gale, and subsided before the gale lulled; no 
observations could be made to ascertain whether the state of the tide had 
anything to do with this. The height to which the water rose was some- 
what under halfan inch. After the earthquake of August 17, 1868, this 
spring in the tunnel increased to such an extent that it laid the rails slightly 
under water; after a few days it decreased again to its former volume. 
Art. LXXXV.—Notes on a Salt Spring near Hokianga. By J. A. Pond. 
[Read before the Auckland Institute, 9th September, 1878.) 
Ix looking over the Transactions of the New Zealand Institute, just to 
hand, I read with pleasure the paper by W. Skey, on the Mineral Waters of 
New Zealand, in which he gives the analyses and description of waters from 
all known springs in the Colony. As we might expect, the North Island, 
and partieularly this district, has supplied the large majority of samples; 
but though much has been done in this respect there are very many springs 
containing mineral salts, and having medicinal properties, which still remain 
unexamined, and leave a rich field for those having the will and capacity to 
bring them to light, or rather to the Transactions. 
Some months 'ago, Judge Monro first mentioned the existence of a salt 
spring to me, and on a later occasion kindly placed a few ounces of the 
water at my disposal, too small an amount to make a complete analysis of, 
but as its especial characteristic was its saline nature, I have made a partial 
quantitative analysis, which I give below. 
