574 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



some time past in suggesting points for legislation. The 

 principal part of the enactments have reference to the pollu- 

 tion of water by the discharge of refuse animal, solid or liquid, 

 matters into it ; and as it may be of interest to our readers 

 to know what the" highest sanitary authorities in England 

 consider as "pollutions" of water, we append their definitions 

 of the same as given by the act. 



1. Any liquid containing in suspension more than, three 

 parts, by weight, of dry mineral matter, or one part, by 

 weight, of dry organic matter in 100,000 parts, by weight, of 

 the liquid ; or, 



2. Any liquid containing in solution more than two parts, 

 by weight, of organic carbon, or 0.03, by weight, of organic 

 nitrogen, in 100,000 parts, by weight, of the liquid ; or, 



3. Any liquid which exhibits by daylight a distinct color, 

 when a stratum of it one inch deep is placed in a white por- 

 celain or earthen-ware vessel ; or, 



4. Any liquid which contains in solution, in 100,000 parts, 

 by weight, more than two parts, by weight, of any metal, ex- 

 cept calcium, magnesium, potassium, and sodium ; or, 



5. Any liquid which, in 100,000 parts, by weight, contains, 

 whether in solution or suspension, in chemical combination or 

 otherwise, more than 0.05 part, by weight, of metallic arsenic; 



or, 



6. Any liquid which, after acidification with sulphuric acid, 

 contains, in 100,000 parts, by weight, more than one .part, by 

 weight, of free chlorine ; or, 



7. Any liquid which contains, in 100,000 parts, by weight, 

 more than one part, by weight, of sulphur, in the condition 

 either of sulphureted hydrogen or of a soluble sulphuret; or, 



8. Any liquid possessing an acidity greater than that which 

 is produced by adding two parts, by weight, of real muriatic 

 acid to 1000 parts, by weight, of distilled water; or, 



9. Any liquid possessing an alkalinity greater than that 

 produced by adding one part, by weight, of dry caustic soda 

 to 1000 parts, by weight, of distilled water. 20^4, March 16, 

 1872,321. 



UTILIZATION OF LIQUID SEWAGE. 



A contract has recently been entered into by the police 

 board of Glasgow for the supply from the public urinals of 



