12 
Desmidi^e. 
Micrasterias rotata 
Tetmemorus Brebissonii 
Arthrodesmus convergens 
Closterium lunula 
Euastrum didelta 
Scenedesmus quadricandi 
Although to the non-microscopical reader this may appear a formidable 
list of organisms inhabiting the water we drink, yet it is not so in reality. 
Nay, their very presence proves its purity, for they will not live in any but 
good fresh water. The absence of animal life is very remarkable, and 
redounding highly to the well-known skill and ability of the Company's 
Engineer. In concluding his paper the author congratulated his fellow 
citizens in having such a supply at their disposal. 
