Farr and Florancb. — Influence of Ripjiles. 



237 



Art. XXVIII. — On the Influence of Ripples on the Gas Content of the 



Artesian Waters of Christchurch. 



By C. Coleridge Farr, D.Sc, and D. C. H. Florance, M.A., M.Sc.'J 

 [Read before the Philosophical Institute of Canterbury, 6th October, 1909.] 



This paper may be regarded as a continuation of a paper read before the 

 Institute on the 13th July. The work was undertaken to ascertain the 

 gas content of some of the artesians about Christchurch, and how quickly 

 the content was altered to the normally saturated condition by rippling 

 over obstacles. The wells examined were the Museum well and the well at 

 the fish-hatcheries. At the Museimi a series of four boxes was placed £.0 

 that the water ran from one to the other in open channels. The distances 

 were : From box 1 (into which the water ran direct from the well) to box 2, 

 3 ft. ; box 2 to box 3, 6 ft. ; and box 3 to box 4, 5 ft. The gas contents 

 of these were all examined several times, with the following results : — 



Determination. 

 C.c. per Litre at N.P.T. 



Throughout this work the CO 2 includes also any that might be given off 

 by bicarbonates in solution on heating. 



Tests were made for SHj and SO2, which showed that there was no 

 appreciable quantity of either present. 



Gas Content of Water at Fish-hatchery. — The water in the Acclimatisa- 

 tion Society's hatchery boxes was also examine d, the top box of the series 



