172 



Essai siir des Eaux de Boston 



fois plus tartl, elle redevenoit potable, et cela dans toiite 



On verra par I'analyse suiyante la difference, que 



saiiion. 



j'ai trouvec du soir an matin suivant. 



En observant pendant longtems, on ponrroit pent-etro 

 donner des raisons satisfaisantes d'un changement si snbit. 

 Un puit situe im pen au dessous, et que M. Greenleaf m'a dit 

 etrc foumi d'eau par le sien, ponrroit peut-etre aider a rendre 

 raisonde ce fait. Mes hypotheses ne me satisfaisant pas a 

 ce sujet, pour les communiquer S. 1' Academic, je me con- 

 tenterai dans ce moment a donner f analyse de I'eau : J'obser- 

 verai que cctte analyse ne pourra se dire complete, que quand 

 on I'aura repetee un nombre de fois, a diJBTerens terns 'vu 

 rinegalitc de ses resiiltats. 



Voici ce que m'a fourni la premiere analyse. ^ 



L'eau . avoit une apparence un pen opaque, uiie odeur 

 d^sagreable, un gout nauseabond, astringent. En la versant 

 de haut, elle petilloit. Son poids est de cinquante grains 



par 



a little longer afterwards, it would be good and wholesome again : and tliesc changes 



ft 



were observable in ererj season. It will be seen bj the. following examination, what 

 difference was observed from m^\U to the next morninfT^. 



Perhaps after long observation, we might be able to give satisfactory reasons for so 

 sudden a change. There is a well a little below, which Mr. Greenleaf says is supplied 



mi 



facts. My hypothesis however, is not so satisfactory, as to induce me to submit it to 

 the Acaclemj-, and I shall content myself at present, with the folloTving analysis bf the 

 Vater; observing that this analysis cannot be called complete, till the experiments have 

 been often repeated, and till wc have at different times observed the inequality of the 

 seyeral results. 



The first examination was as follows : 



Tlie %Yater appeared a litde opake, having a bad smell, and a nauseous, astringent taste. 

 Toured from on high it sparkled. It is fifty grains in a pint * lighter than diltillcd wa- 



* An English Qnai-t. 



ter 



