Hydrant. Ap. 19, 

 Unfiltered. 



Grs. per g 



Total solids 41-63 



Analysis of residue. 



Silica 18.17 



Iron and alumina 8.95 0-06 



Sulphate of lime 2.72 2.84 



Carbonate of linie 3-27 5- 



Sulphate of magnesia 3'7i 2.90 



Water, carbonic acid, 



and loss 4-84 2.00 



Organic matter, parts per 1,000,000. 



Total organic 38. 28 19-14 



Free ammonia 0-004 0.004 



Albuminoid ammonia 0.15 0.06 



Jan. 23, 1878. 

 Filtered. 



Grs 

 Total solids.. 



per gal. 

 14.17 



Analysis of residue. 

 0.07 



Taken above Alton. 



Grs. per gal. 



Unfiltered 58.32 



Filtered 12.07 



Analysis of residue, 

 0.5S 

 0.22 

 4.78 

 1.58 

 3-12 



1.92 



68.86 

 0.026 

 o.8q 



From this table it appears that the Mississippi water contains 

 more organic impurities than the Missouri, and that the Missis- 

 sippi water contains more sulphates, while the Missouri water 

 contains more carbonates. For this reason the Mississippi water 

 gives much greater difficulty when used for boiler purposes, be- 

 cause the sulphates give more trouble in boiler practice than the 

 carbonates. 



Dr. George Richter was elected an associate member. 



Adjourned. 



Afril 6, 1885. 



The Academy met April 6th, 1885, at the Academy rooms, 

 President Nipher in the chair, and the following members pres- 

 ent : Messrs. Leete, Fritchett, Todd, Foote, Curtman, Sander, 

 Tivy, Poliak, Wheeler, Hambach, Walker, Evers, and Engleri 

 also four visitors. 



Minutes of last meeting read and corrected. 



Dr. Todd exhibited a specimen of the fruit of the Casava plant 

 from Florida. 



Prof. Nipher presented a paper on "Two Ergometers," and a 

 paper on ''The Efficiency of two Holtz Machines, one acting as 

 Generator and the other as Motor." Both papers were fully illus- 

 trated by diagrams. On motion, they were referred to the Com- 

 mittee on Publication, 

 iv. — 4 — B 



