in Melbourne. 187 



paradoxTim, docidium Ehrenbergii, arthrodesmus sp., closte- 

 rium intermedium. 



Rotifer vulgaris, many ; anguillulas (mostly dead in A, 

 but very abundant and lively in another sample), Parame- 

 cium abundant, bursaria, euplotes, kolpoda, vorticella 

 microstoma, acineta or podophrya, loxodes, peridinium, 

 leucophrys. 



Saonijle V. (Stvanston-street gutter.') — Turbid, depositing 

 much earthy and other suspended matter, which was dis- 

 regarded, smell filthy and fsecal. (The Elizabeth-street 

 Sample IV. had similar characters, but less strongly marked.) 

 Solid residue, per gallon - - 43 "680 grains. 

 Fixed organic matter, do. - - 11 120 „ 

 Inorganic matter, do. - - - 32'560 ,, 



The evidences of the presence of carbonic acid, ammonia, 

 and sulphuretted hydrogen were very decided. 



The microscopic objects contained were as follows : 

 Vegetal tissues various, woody fibre, hair decaying, 

 mucedinous fungi, confervse, desmid, staurastrum brevispi- 

 num, vorticella microstoma, uvella abundant, bursaria, 

 trepomonas, monads various, disoma many, enchelys, 

 astasia bodo, leucophrys, trichoda angulata, paranmecium, 

 kolpoda. 



See Photograph, Plate II., fig. 2. 



Sample VI. (Fitzroy Gardens gully.) — General characters 

 as the last sample. Very foetid and turbid. 



Solid residue, per gallon - - 28-368 grains. 

 Fixed organic matter, do. - - 10-880 „ 

 Inors^anic matter, do - - - 17,488 „ 



Carbonic acid, ammonia and sulphuretted hydrogen 

 strongly marked ; sulphurous acid was also found. 



The microscopic matter was similar in character to the 

 last sample ; most of the same organisms and fragmentary 

 structures being found. 



Sample VII. (Yan Yean water from service.) — Clear and 

 sweet, very minute bright green deposit on long standing, 

 the water being then quite bright. 



Solid residue, per gallon - - 8-736 grains. 

 Organic matter, do. - - - - 2-152 ,, 

 Inorganic matter, do. - - - - 6-584 ,, 



No ammonia or sulphuretted hydrogen. 



