358 



PROCEEDINGS OF SECTION D. 



The mean of several determination of the gaseous constituent 

 in these four boxes gave the following results : 



Box 1. 



Nitrogen, argon, etc. 

 Oxygen 



Carbon dioxide 

 Radium emanation. 



Box 2. 



Nitrogen 

 Oxygen 



Carbon dioxide 

 Radium emanation. 



Box 3. 



Nitrogen 

 Oxygen 



Carbon dioxide 

 Radium emanation. 



Box 4. 



Nitrogen 

 Oxygen 



Carbon dioxide 

 Radium emanation 



18.52 cc. per litre N.T P 

 4.30 



1.19 ,' ]| 



197 arbitrary units 



17.76 cc. per litre N.T.P 



5.27 



1.40 ,. '' 



179 arbitrary units 



17.81 cc. per litre N.T.P. 

 5.00 



0.95 ,, [' 



164 arbitrary units 



17.51 cc per litre N.T.P. 

 5-24 

 1.03 



150 arbitrary units 



_ The carbon dioxide includes besides free carbonic acid that 

 giving off from bicarbonate on heating, whilst tests made for 

 sulphuretted hydrogen and sulphur dioxide showed no appreci- 

 able quantity of either. 



Experiment at the Fish Hatchery. 



A good deal of attention was paid to the effect of artesian water 

 on the hatching of trout and on very young trout. The first set of 

 experiments were conducted in a set of five pairs of boxes, the two 

 boxes in each pair being similarly placed with regard to the well, 

 the water in which was therefore derated to the same extent. The 

 water flowed from the first pair into the second over a fall of about 

 four inches, and then to the third over a similar fall, and so on. 

 Seven thousand five hundred " eyed " eggs were placed in each box, 

 making 15,000 in each pair, and the number of eggs which died 

 were counted. The following table gives the number of eggs so 

 dying before hatching, along with data regarding the gases. The 

 figures are for 15,000 eggs. 



