360 proceedings of section d, 



Well No. 1. Supplying Set of 5 Pairs Hatching Boxes. 



Well No. 2. Supplying Set of 8 Boxes. 



It will be seen from the radium emanation content that the 

 first of these wells was the same as used in the hatchery last year. 

 The gas content of this well is least, and this is probably due to the 

 fact that what we wanted was to detect any difference in the gas 

 content of the two walls rather than to determine absolutely the 

 amount of the dissolved gases. For this purpose the water under 

 examination was always boiled vigorously for an hour, whereas on 

 the previous citation of gas content, it was boiled till the last trace 

 of gas was driven out — a process occupying some three or four hours. 



It will also be seen that whilst, as has been said, the two wells 

 differed markedly in radium emanation, they are exceedingly alike 

 in nitrogen content, whilst they differ in oxygen and in carbon 

 dioxide. As most of the carbonic acid is in the form of bi- 

 carbonate, the well only containing a very small amount of free 

 carb., the difference is not important. There is evidence therefore 

 that if the table shows any difference in the behaviour of the wells 



