Miscellaneous Bibliography. 447 
filters of this sort are required, leaving one always out of use for 
cleaning the surface of the filter bed of the accumulated sediments. 
Mr. Kirkwood’s researches extended not only to the great works 
i i so 
portant end in con- 
vincing city councils elsewhere of the great importance and early 
practicability of delivering to consumers only limpid waters purged 
Survey, showing the progress of the survey during the year 1866. 
i e 
port there was a similar treatise upon th f the plane table, 
the general aim b ing to gradually embrace the whole range of 
Coast Survey Manual. : ; . 
In this volume are also reproduced all the articles of general sci- 
settled. This will make the quarto reports complete as to papers 
trial Chemistry; by AWRENCE Suiru, U. 8, Commissioner to 
the Paris Universal Exposition, 1867. 146 pp. with vi plates 
Washingto , 1869.— subjects selected by Smith for this 
Report are discussed under the following heads: Chap. I, 
manufacture of sulphuric acid ; Chap. II, Soda and salts of soda ; 
Chap. IL, Potash and its compounds; C monia, ba- 
magnesia and alumina; Chap. V, Chlorine, fluorine, manga- 
nese, and carbonic acid; Chap. V1, Industrial production of oxy- 
