Philosophical Institute of Canterbury. 47 



2. " On some Further Experiments on the Effect of Artesian Waters 

 on the Hatching of Trout,"' hy ('. Coleridge Farr, D.Sc, and D. B. 

 Macleod, M.A. 



The experiments and observations locorded in this pjiper are a continuation 

 this year ot those carried out in the winter of 1909 by Farr and Florance. Furthei' 

 evidence is adduced that both the inortahty amongst the unhatched eggs and the 

 disease known as "blue swelling" are due to want of ;ierati.)n, and diminish 

 as the water becomes more normal in its gas-content. An endeavour is made to 

 decide the particular constituent in excess or defect in the water to which the 

 troubles are due. The evidence points to their being either owing to the little 

 oxygenation of the water, or to there being too much radium-emanation in it. 

 Excess of nitrogen exists in the water, as with last year's result, and the possi- 

 bility of either the mortality of the eggs or "blue swelling" being due to this is 

 discussed and shown to be small. The thanks of the authors are cordially tendered 

 to the Council of the Acclimatization Society, and to Mr. Charles Eides, the 

 director of the fish-hatchery. 



3. " On the Physiological Pifl'ccrs of Radium-emanation," by W. H. 

 Symes, M.D. " 



The author gave a general account of the properties of radium, paying special 

 attention to those relating to its enormous energy. He then suuimarized the known 

 effects of the emanation on different diseases and pathological conditions, the ques- 

 tion ot its effect on cases of cancer and goitre receiving the attention that the 

 prevalence of those forms of disease demands. At the conclusion a very hearty 

 vote of thanks was accorded to Dr. Symes for his interesting and informing 

 address. 



■2 Proc, pi. ii, 



