OF ARTS AND SCIENCES. 173 



December 26, 1854. — Monthly Meeting. 



The Academy met by invitation at the house of the Pres- 

 ident. The President in the chair. 



Professor Felton, at the invitation of the President, gave an 

 account of the present aspect of Greece, from personal obser- 

 vation during a recent visit to that country. He represented 

 its condition as being extremely interesting, from the promise 

 which it gives of literary and scientific development. He 

 spoke of the schools and universities, the public press, the 

 condition of the language, and the prevailing spirit of the 

 people, as giving ground for sanguine expectations of the 

 regeneration of that classic land. 



Fonr Iiundred and nintli meeting. 



January 9, 1S55. — Monthly Meeting. 



The President in the chair. 



Dr. A. A. Hayes read the following paper on the present 

 condition of the Cochituate water, entitled, " On a Remarkable 

 Change which has taken place in the Composition and Char- 

 acters of the Water supplied to the City of Boston from Lake 

 Cochituate, by A. A. Hayes, M.D., Assayer to the State of 

 Massachusetts." 



" In the study of the chemical composition of waters used for do- 

 mestic purposes, a wide field is open for inquiries of high scientific 

 interest ; as the accurate comparisons of diffei'ent waters lead us 

 through both departments of modern chemistry, the organic and in- 

 organic. This interest is, however, secondary to the importance of 

 careful inquiries in an economical view, as we have actions of waters 

 on substances with which they come in contact at one point, modify- 

 ing their composidon, so as to render them purer, or less salubrious ; 

 and when a water passes some distance, its characters may thus be 

 made to differ at different points. Not only is the water changed by 

 different bodies with which it is brought in contact, but conduits of 

 masonry or iron are in special cases rapidly destroyed. 



