ON COLLOID CHEMISTRY AND ITS INDUSTRIAL APPLICATIONS. 93 
A complete bibliography of the activated sludge process will 
be found in Porter’s publication, given in the list of references 
submitted. 
BIBLIOGRAPHY, 
1901. 
* 33rd Annual Report of State Board of Health,’ Mass,, p, 272-5. 
Examination and analysis of original sediment and suspended solids discharged 
from percolating filter. 
‘Annual Report Rivers Department,’ March 1901, pp. 40-41. 
Determination of colloidal iron in open septic tank effluent. Suggested dialysis 
as a means of studying colloids in sewage and effluents. 
1905. 
KATTEIN & LUBBERT, ‘ Gesund. Mag.’, No. 25. 
Absorption phenomena occurring in sewage filter beds, 
1904. 
BILTZ U. KRouNKE, ‘ Hyg. Runds.’, 1 Mai, 1904. 
‘ Ueber organische Kolloide aus Stidischen Abwasser und deren Zustandsaffinitat.’ 
Considerable proportion of the oxidisable matter in sewage, after filtration paper. 
is incapable of passing through a parchment membrane. State sewage colloids have 
a negative charge and are precipitated by iron and zirconium salts. 
‘36th Annual Report of State Board of Health,’ Mass, 
Time of passage of sewage through percolating filter determined. 
Results of 15 to 18 years continuous operation of sand filters, only 4 or 5 per cent 
of total nitrogen applied to filter was retained in the sand, That this material is 
very resistant to bacterial action, 
1905. 
FowLer & ARDERN, ‘J.S.C.I,’ No. 9, vol. xxiv. 
‘Suspended Matters in Sewage and Effluents.’ 
Dialysis of sewage showed appreciable quantities of oxidisable matter in pseudo- 
solution—proportion of whole varies considerably with different sewages. Suggest 
method as a means of gaining additional information with respect to purification 
TOCess. 
Pion DE, M., ‘ Jour. Amer. C.S.’, vol. xxvii., No. 4. 
‘Contribution to the Bio Chemistry of Sewage Purification. The Bacteriolysis 
of Peptones and Nitrates.’ 
Studies carried out at the Lawrence Experimental Station, Mass., under the 
direction of H. W. Clark. 
CHICK, HARRIETTE, ‘ Proc. Roy. Soc,’ B., vol. xxvii. 
‘A Study of the Process of Nitrifleation with Reference to the Purification of 
Sewage.’ 
1906. 
O'SHAUGHNESSY & KINNERSLEY, J.S.C.I. No. 15, vol. xxv. 
‘The Behaviour of Colloids in Sewage.’ 
Extension of preliminary investigation by Fowler and Ardern, and determination 
of source of colloidal matter. 
JONES & TRAVIS, ‘ Proc. Ins. C. E.’, vol. clxiv., pl. 2. 
‘The elimination Of suspended solids and colloidal matter from sewage.’ 
De-solution theory of sewage purification developed as the result of experience 
with the working scale plant (Hampton Sewage Works) ; and a series of experiments 
with regard to the possibilities of physical action on sewage colloids. 
JoHNsToN, J. H., ‘J. Roy. San. Ins.’, vol, xxvii., No, 10. 
“ The Organic Colloids of Sewage.” 
.Description of Hampton experiments with regard to de-solution theory, 
LUBBERT, ‘ Gesund. Ing.’, 1906. 
‘On the nature of the action of oxidation filters.’ 
State Board of Health, Mass, ‘ Annual Report,’ p, 283, 
