142 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



The results will be found in the table at the end. 



9. — Minor Constituents of the Water. 



These consist of Iron, Bromine, Ammonia, Nitrites, and 

 Nitrates. 



None of these were estimated, though attempts were at 

 first made to do so, as they are present in such small 

 quantities that larger volumes of water than I had at my 

 disposal were found to be necessary for their determination. 



Iron. — Attempts were made to estimate this colouri- 

 metrically with ammonium sulphocyanide and a standard 

 solution of iron alum, but it was found almost impossible 

 owing to the extreme paleness of the tint. 



Bromine. — No attempt to estimate this was made, but 

 using the figures given by Dittmar in the Challenger report, 

 the total Halogen (not ' Chlorine ') may be obtained by 

 multiplying the chlorine values given in this paper by 

 1*001681. 



Ammonia. — This appears to be absent, or very nearly so, 

 as Nessler's solution produced no visible colouration. 



Nitrites. — These do appear to be present to some trifling 

 extent, especially at inshore stations. Their determination 

 was attempted colourimetrically by means of a solution of 

 metaphenylenediamine sulphate, but the tint obtained, 

 though visible, was so faint that no further trials were 

 made. 



Nitrates. — No attempts to estimate these were made. 



It is to be regretted that lack of time and apparatus 

 prevented me from estimating the magnesium, alkalies, 



