434 Miscellaneous Bibliography. . 
bers and its supplement more than he can inwardly digest. In the 
appendix many of the scientific and mechanical tigre of the 
last few years are well treated of, such ‘for example, 
Engine; Electro-magnetic Engine of Wilde ; 
5 
Biwi, machines 
including Root’s of the U. 8; Armorer Plates; ; Artificial Limbs; 
Breech- loading arms (deficient i in no mention 
of important Amer- 
ican forms) ; Cattle Plague; Chemistry ; Coal Supply; ier 
Fi 
igures ; ompress sed AirEngine ; Dipsomania ; 
Floating Doc 
Meteors; National Education (an elaborate and pala ge paper 
Nitro-glycerine ; oe iameene Machines; [Here again the Ameri- 
ean researches of Twining reproduced in the English Ettier refrig- 
and the air rarefactoire of Gerrie described in a series of articles 
maintain the status of the excellent Encyclopedia by the addition 
of an annual volume as has been done by the Appletons for the 
American Enc 
cyclopedia, 
7. Mitchel?’s Manual of Practical Assaying, 34 edition. Ed- 
.S. Lond 
ited by Writ1am CrooKkEs, 
lvii of tables. London, 1868 (Long gmans, Green & Co).—Miteh- 
any cases veep ster before difficult and uncertain. These, as 
Walls as the blowpipe assay by the latest methods of Prof. Kerl, 
are found fully set forth in this pe — thus becomes the 
best manual for practice in our lan 
English weights and measures is still rated 
cessitated by the law requiring assay re 
The use of the old 
to, as indeed is ne- 
be made in ounces, 
penny weights and grains, all ‘the gold Sua silver tables being Sind 
dered in the same terms. In the volumetric wri owever, the 
rational methods of the metrical system are employ 
onthly Journal t devoted i the sits sd 
re 
commends itself to all whose tastes or vocations lead them im this 
direction. The articles are original, critical and suggestive; 
Hustratious varied, numerous and bea utifully executed, an 
ist Wl 
ciate as bringing to a practical test the examples given. 
have 
It is a work wht 
the 
German more than to any other people do we owe the recent rapid 
