f8 JOURNAL OF FORESTRY 



iaw to take whatever measures may be necessary for the purification 

 of their waste water, irrespective of the difficulty that may be involved 

 in doing so. This law should be enforced, and in the industrial recon- 

 struction of the devastated districts special precautions should be taken 

 to see that the new factories which must be built are properly equipped 

 to care for their waste waters. This is desirable from every point of 

 view and would greatly facilitate the much-needed development of fish 

 culture. S. T. D. 



Demorlaine, J. La recoiistitution industriellc ct Ics dcvcrsemcnts rcsiduaires. 

 Rev. Eaux et Forets. 58:100-102. 1920. 



The problem of sewage disposal has been 

 The Problem of solved at Strassburg by the construction of stag- 

 Sewagc Disposal nant ponds in which the organic material is 

 assimilated by protozoaires, worms, crustaceans, 

 insect larvae, molluscs, etc., and these in turn are eaten by carp and 

 other fish. The latter are entirely safe for human consumption and 

 have no disagreeable taste. One hectare of pond is sufficient to dis- 

 pose of the sewage from 2,000 to 3,000 people (nearly ten times as 

 many as can be cared for by filtering the waste water in settling basins), 

 and at the same time to support an abundant population of fish. This 

 method suggests to foresters the possibility of introducing organic 

 matter into the many ponds and streams found in the plains where 

 communal forests cover more than 30 per cent of the land area, and of 

 using these for the breeding of carp and other Cyprinides, which would 

 form an important addition to the food supply of the country. 



S. T. D. 



Jolyet, A. Les bassins d'cpuration du Waczven a Strasbourg et L'elevage des 

 Cyprinides. Rev. Eaux et Forets. 58:195-202. 1920. 



