Toum Setvafje. 



489 



now so far purified before being- discharged, as rather to attract 

 the fish ; and those having the right of fishing in the river have 

 found it worth while to fix gratings to prevent their going up the 

 main outfall from the sewage-irrigated land. 



Table X . — Partial Analyses of the Croydon Sewage before application, 

 of the Drainage-water from the Irrigated Land, and of the River Wandle, 

 above and below the Drainage Outfall from the Irrigated Land. 



Grains per Gallon. 



Although further experience is still wanting to determine 

 what amount of sewage can be safely applied to a given area 

 under different conditions of soil, subsoil, &c., there can be no 

 doubt that, when large quantities of sewage are applied to grass- 

 land, the arrangements should be such as to allow of the drain- 

 age-water being collected and re-used in such a manner as to 

 insure as far as possible both complete utilisation and complete 

 purification. 



EXPEEIENCE OF COMMON PRACTICE IN THE UTILISATION 



OF Sewage. 



Let us now turn from the results of experimental inquiry to 

 those of practical experience in the utilisation of town sewage. 

 The instance most frequently quoted is that of the neighbour- 

 hood of Edinburgh, relating to which some particulars are given 

 in the following Table : — 



