446 Miscellaneous Bibliography. 
It appears from the once in the Appendix, that seg ee ani- 
mals in considerable numbers have been presented to the Commis- 
in the grounds. ‘We understand also that an extensive museum 
bes ne gee yas and the first steps taken toward its establishment. 
The park will thus become a means of national entertainment and 
of instruction, in fact a great center of knowledgé for the people. 
2. pete on the Filtration of River Waters, for the supply of 
as peer in Europe, made to the oard of Water Com- 
missioners of the City of St. Louis, by Jamus P. Kirk woop, _— 
Engineer. Published by permission of the Board. 178 pp. 
Ilustrated by thirty engravings. New York, 1869. (D. Van Soe 
trand, publisher, 23 Murray St. London, Tribner & Co. )—Fully 
the only adequate supply is by pumpin r from rivers whic 
are at all times more or less sneha aid an e  pesiadionllYy liable to 
floods which surcharge them with mud and slowly settling sedi- 
ments. 
a Kirkwood’s system for ee Louis embraces both subsiding 
settling reservoirs, reservoirs for unfiltered water after the 
Th 
the spl ciption. The filter beds are formed as follows, 
commencing aease 
Fine ata aati? 18 inches. 
oarse sand, | ate 
FAVGL, POR Bie6; 2 St ..* 
nut size, ‘Re 
Broken stones, Meste * geek iu 
Drain pipe, - -- pes 
Puddle bottom. 
e rate of filtration spesash such a series of beds is found to 
be 75 imperial gallons per for each square foot of fil 
ce d, or hala a hale foot per hour. The size of the fil- 
ter beds proposed for St. Louis has been assumed to be 260 by 156 
feet, giving an area of 37,440 square feet, yielding at the rate above 
3,360,847 United States gallons in Swents tue hours. To 
supply 12,000,000 U. 8. gallons daily required by St. Louis, five 
