94 REPORTS ON THE STATE OF SCIENCE.—1918. 
1907, 
Digpin, ‘ Analyst,’ April, 1907. 
The disposition and analysis of sewage debris in contact bed.’ 
Concludes that there is a considerable destruction by biological agency of the 
matters deposited in slate beds at Devizes. 
BiLTz & KROHNKE, ‘ Z. angew. Chem,’ 1907. 20, 883-887. 
A Description of Colloid Matter from Sewage. 
Partial separation of oxidisable matter obtained by the dialysis of sewage by 
treatment with various solvents—Benzene, carbon-bi-sulphide, nitro-benzene and 
petroleum. 
CLARK, H. W.,‘ Eng. New,’ 57, 607, 
Comparative disposition of organic matter by sand, contact and sprinkling filter, 
CLIFFORD, W., ‘J.8.C.1.’, vol. xxvi.. 739. 
‘The time of passage of liquid through percolating beds.’ 
Employed a modification of the St, Lawrence Experimental Station, Mass., where 
salt solutions were used. 
RcBner, M., ‘ Archiv. fur Hygiene,’ 14, 
‘ Das Stadtische Sielwasser und seine Beziehung zur Flussverunreinigung..’ 
1Recommends separation of colloids in sewage (after settlement or filtration 
through paper) by boiling with solutions of iron alum and acetate of soda. 
Fow Ler & GaUNT, ‘J.S.C.1.’, No. 13, vol. xxvi. 
‘The interaction of dilute solutions of ammonium salts and various filtering media,’ 
ROHLANDS, P., ‘Z. Chem. und Ind, Kolloide,’ 1907, 2, Abst. ‘J.S.C.I.’, vol. xxvii. 
p. 34, 
‘Clay as a semi permeable and its use for purifying factory effluents, and sewage.’ 
Shows absorptive properties of plastic clays. 
FREUNDLICH, ‘ Z. angew. Chem.’, 20, 749-50. Abst. ‘J.S.C.1.’, vol. xxvi., 646. 
‘Colloid precipitation and absorption.’ General discussion of the properties of 
colloidal ‘ sols.’ 
DzIERZOWSKY, ‘Gesund. Mag.’ 1907, 
‘Zur Theorie Kunstlicher Biologische Filter.’ 
Absorption phenomena. 
DunBaR, Hamb., 1907, trans. by Calvert—Griffin, & Co., Ltd, Strand. ‘Principles 
of Sewage Treatment,’ 1908. 
Text book on the subject. Gives comprehensive references, especially to his own 
and his colleague’s work, in connection with the development of the absorption 
theory. 
1908. 
CLIFFORD, W., ‘ Proc. Ins. C. E.’, vol. clxxi., part ii. 
‘On Percolating Beds.’ 
A continuation of a previous study, see ‘J.S.C.1.’, vol. xxvi., 739. 
Fow.LeEr, Evans & ODDIE, ‘J.S.C.I,’, vol. xxvii, No. 5. 
‘Some applications of the ‘ Clarification Test’ to sewage and effluents.’ 
Rubner’s test of precipitation of colloidal matters in sewage by means of acetate of 
iron, examined and compared with results obtained from dialysis. Recommend 
use in control of sewage purification plant. 
TRAVIS, OWEN, ‘ The Surveyor,’ vol. xxxiv., 63-66. 
vol. xxxiv., 625-7, 604-6. 
and vol, xxxv., 7-10. 
LUBBERT, A., ‘ The Surveyor,’ vol. xxxiv., 575-8, 598-600. 
(1909), vol. xxxvi., 109-111. 
‘The Hampton Doctrine in relation to Sewage Purification.’ 
Prolonged discussion between Travis and Liibbert as to respective merits of 
Travis’s ‘ De-solution’ theory and Dunbar’s ‘ Absorption’ theory. Liibbert’s commu- 
nication translated by Calvert. 
1909. 
Rouants, ‘7th Int. Cong. App. Chem.’, London, 1909. 
Section viiia., 161-£69, Partridge & Cooper, London, E.C., 1910. 
‘Les Matieres organique colloidales dans les eaux d’egout.’ 
Examination and modification of Fowlers ‘Clarification Test,” and estimation. 
of colloidal matters in sewage, septic tank effluent and filtrates from contact beds. 
JOHNSON, J. H., reference as previous p. 171-177. . 
‘Physical and Biolytic factors in Purification of Sewage.’ 
Concludes from experiments given that physical factor is very great, and that 
the biolytic operation is a very lengthy one, 
