RECORDS OF MEETfXGS 427 



parts. Close examination of the anatomy of these larvae iisnally reveals 

 tlie character and extent of the fusion of the eggs that produced them. 

 In general the extent of the morphological disturbance in experimentally 

 grafted organisms was proportional to the area of the surfaces hroiiqht 

 into contact. 



The paper was discussed by Doctors IJhlenhut, Eiddle, Pike and 

 Schulte. 



The Section then adjourned. 



William K. Geegoky, 



Secretary. 



SECTIOX OF ASTEONOMY, PHYSICS AXD CHEMISTEY 



18 OCTOBEK, 1915 



Section met at 8 :15 p. m., Vice-President Charles Baskerville presid- 

 ing. 



The minutes of the last meeting of the Section were read and approved. 

 The following programme was then offered : 



J. C. Olsen, Electeolytic Method of Sewage Disposal. 

 H. V. Arny, Staxdaedized Coloeed Fluids. 



SUMMAEY OF PaPEES 



Professor Olsen said in al^stract : The method described has been in 

 operation at Elmhurst, Borough of Queens. City of New York, for about 

 a year and a half. An experimental apparatus of 25,000 gallons daily 

 capacity was first installed and tested. The results were so satisfactory 

 that a half million gallon unit was installed and has been in operation 

 for about six months. 



The machine contains over a thousand iron plates which act as elec- 

 trodes. The sewage passes in thin sheets betw^een the plates. Eotating 

 paddles between the plates serve to remove any deposits which may form 

 and short circuit the current. The current used is about 30 amperes and 

 80 volts. 



The sewage first passes through a one-fourth inch screen, then through 

 the electrolytic machine, after which milk of lime is added. It then 

 passes through four sedimentation tanks. 



The electrolysis produces about 2 c. c. of anodic oxygen per liter of 

 sewage. This oxygen acts upon the dissolved organic matter in the sew- 

 age. The current also precipitates colloidal matter dissolved in the sew- 

 age. When the lime is added to the electrolyzed sewage, heavy flocks are 



