Chemical Examination of Natural Waters. 219 
itie region, which was not however: the case... The seinen 
amined were severally as follows. 
Water No.1. From Mystic Pond, near Boston, about 60 rods above 
the outlet, taken from the surface, 100 to 150 feet from the shore, 
where the depth was more than 10 feet, collected August 16, 1845. 
No. 2... Croton River, N. Y. taken from the upper reservoir, City of 
‘New York, near the S. E. corner and near the outlet leading to the dis- 
tributing reservoir, collected August 25. 
No. 3. Spot Pond, taken July 17th, 150 to 200 feet from the 
proposed outlet of conduit, and from the surface,—over a depth of 
13 feet. 
No. 4, Schuylkill, Philadelphia; ni Ph Avg. 234, 100 to 200 feet 
shore the fore- -bay in the pool of Fairmount dem, 
o. 5. Long Pond, Mass., collected July 19th, from the point of 
exit of eta aqueduct, 150 to 200 feet from shore, Taken from 
the surface where the depth was 10 feet. 
‘No. 6. Charles River, Watertown, Mass., collected July 29th, 150 
to 200 feet above the lower dam, in the middle of the stream. 
“No. %:? Charles River, South Natick, Mass., collected July 22d, in 
~ middle of the pool, and 200 feet above the dam. 
0.8. Spot Pond, Mass., between the island and southeast shore, at 
Sand 13 feet depth from the surface, collected Sept. 3d and 6th. 
No. 9. Long Pond, Mass., upper division, from a depth of 62 feet, 
a. Sept. Sth. 
10. Ber ~ Mass. 26 feet cep tems locality as No. 8— 
ll’ Aug. 
No. 11, spel a cael on “pre promises of ae K. Mills, Esq. No. 
20 Beacon street, Boston ; taken Oct. 1 
In color and transparency, these waters range almost exactly, 
in the order of their numbers. No. 1, being most transpar- 
ent and No, 10 least so. No 11 was a very clear water. Nos. 8, 
9 and partcularly No. 10, were very deep brown colored waters. 
No. 10 looked like an infusion of tan bark or weak coffee, and 
had a cape brown precipitate, like hydrate of iron at the bot- 
tom. In ta e, they were generally good and sweet. No. 1 was 
however varie and saline, and No. 11, quite nauseous, from 
amount of common salt and magnesian and lime salts it con- 
tained. The highly colored water, No. 10, was not disagreeable 
in taste, while No. 2, (the Croton, ) bad a decidedly swampy flavor. 
ieasicus dnimalcales were observed in most of them when 
frst examined and Prof. Baily detected in samples sent to him, 
. ec all the common: forms of soft and hard shelled polessenia 
