194- Molybdena. 
water continues to exceed the most sanguine expectations. 
The reader is referred to Vol. VI. p. 375 of this Journal, 
for a notice of the magnificent water works at Fair Mount, 
two miles* above the city, at the falls of the Schuylkill. 
The water power here created, by the natural fall of the 
river, and by an artificial Tay | is made to raise by acting 
on three large wheels, nearly four millions of gallons of 
water in twenty-four hours—a quantity about three times 
the ordinary demand of the city. ‘The supply of water 
isnot only more abundant, but much less expensive, than 
was formerly afforded by steam engines. ‘I'he annual ex- 
pense for raising 3,750,000 gallons of water daily, includ- 
ing current daily expenses, interest on the money expend- 
ed in constructing the new works, damages, &c. is estima- 
at $25,690; “ but,’’ says the report, ‘if the same quantity 
were required to be raised by additional steam engines, 
the annual expense would be at least $75,000’’—*‘ exclu- 
sive of the first cost of the steam engines.” 
It is calculated ‘‘ that with the expenditure of not more 
than $59. 000 for five new wheels and pumps, the quantity 
can be increased to 10,000,000 of gallons in twenty-four 
hours, the water power being suflicient to raise even more 
if required.”? 
A trial of the dam took place last winter from a severe 
freshet, but ‘not the slightest injury was sustained; no 
accident has occurred to any part of the works during 
the last year, during which they have performed in the 
most satisfactory manner; the same observation may be 
made as to the iron pipes in the streets, of which there are 
about nine miles laid without the occurrence of a leak.” 
6. Molybdena.t 
Molybdena is found, about half a mile to the east of the 
turnpike, leading from Saybrook to Middletown, on the 
first road on the Tight hand, above the turnpike gate, near 
the house of the widow Pratt. It is not far from Pettipaug 
meeting house, in a northern direction. 
* In the notice referred to, this distance was incorrectly stated as five 
miles. 
+ Locality communicated by Dr. Timothy Dwight Porter. 
