The Distribution of H;,S in the Lake of Faro 195 



was developed at some time after the formation of the lake itself, 

 by tectonic sinking, and therefore the bottom of the lake took 

 on the foiTn of a funnel. 



The lake of Faro reaches the sea through two canals, one 

 of which, named "canale degli Inglesi" was opened only a short 

 time ago, during my investigations. It is also connected to the 

 nearest lake, Ganzirri, through anotlier narrow and low canal. 

 We must also point out that the two canals connecting with tlie 

 sea are generally closed for most of the year, reducing active 

 circulation of the lake waters. 



Because of these morphological characteristics, the lake of 

 Faro represents an ideal environment for investigations on the 

 distribution of hydrogen sulphide and on consequent microbio- 

 logical problems. 



My investigations were performed during a full year, from 



50 100 



Fig. 1. Lake of Faro. Equidistance of level curves: solid lines 5 m, dotted 



lines 1 m (from 1). 



