434 
considered as the material acted upon and lixiviated by the hot 
water. By the gradual cooling of the volcanic rocks under the 
surface of the earth in the course of centuries the hot springs also 
will gradually disappear. For they too are but a transient pheno- 
menon in the eternal change of everything created. 
Appendix. 
Chemical composition of the water and the silicions deposits of some of the hot 
springs; the analyses executed in the laboratory of Professor Dr. v. Fehling 
at Stuttgart. 
1. Water. 
No. 1. Te Puia-nui, near Tokami on lake Taupo; reaction alkaline; 
analyzed by Dr. Kielmaier. 
No. 2. Tetarata on the Rotomahana; reaction neutral; analyzed by 
Mr. Melchior. 
No. 3. Ruakiwi on the Rotomahana; reaction neutral; analyzed by 
Mr. Melchior. 
No. 4. Rotopunamu on the Rotomahana; reaction neutral; analyzed 
by Dr. Kielmaier. 
In 1000 parts of the waters there were contained, of: 
in No. 1. 2. 3. 4. 
Silica 0.210 0.164 0.168 0.231 
Chloride of Sodium 4.263 2.504 1.992 1.192 
Total residuum 4.826 2.732 2.462 1.726 
Owing to the small quantities of water for analysis (one bottle of each), 
only silica, chlorine — computed as chloride of sodium — and the total amount 
of non-volatile ingredients could be quantitatively ascertained. Qualitatively, 
however, the presence of magnesia, lime, sulphuric acid and traces of organic 
substances has also been proved. 
2. Silicious deposits of hot springs on the shores of the Rotomahana } 
analysed by Mr. Mayer. 
No. 1. Tetarata, two samples, a) an eaithy powdery mass; b ) solidi- 
fied incrustation. 
No. 2. Great Ngahapu. 
No. 3. Whatapoho. 
No. 4. Otukapuarangi. 
