474
SELV BOOlib.
accompany page 1260 and tl?c foottiote' :tdded to page 1 2 5 5 .
('2"
a t bottom of
Plot showing the relation k~ei~veeii sl!eed uf col-rusion of iron in water and tlie partial pressure of the oxygen in the carboil-ciioside-iree :itniosphere. E X P E R I ~ I E S T . I I .DAT.\.
so.
10,2 .
I.
Percentage oxygen. Oranis iron di-iolvt.il.
Percctitape o s y g e n .
(:r, 111si r o n clissolved
18.2
0.018
20.0
0.01;
21.8
0.021
3;.
0.029
18.0
0.031
j2,2
0,041
64.5
0 ,O g i
68.;
72.1
o.oG+
'17. L'
0.05s 0.085
97
o.oS6
.0
I
Concerning the passivity imparted to iron b:- clironintcs, see A. S.Cushman, Bulletin No. 30, Office of Public Roads, IT. S. Department of Igriculture. 1
NEW BOOKS. \\.x.Li.w JICPIIEKSON ASD K'ILLIAAIEDHENDERSOX. Revised edition. viii f 434 1)p. Ginn & Company, Boston. ( S o date on title page.) Price, S1.25.
An Elementary Study of Chemistry. By WARDS
This is an important book for it is niaiiifestly destined to be widely used in high schools and small collegcs and thus to h a w inuch influericc upon education i!i chemistry. In the preface tlie authors say "they have made a consistent effort to make the text clcnr in outline, simple in style and language, conservatively modern in point of view ant1 thoroughly teachable." It is a pleasure to he able to offer congratulations upon the good measure in which tlicse aims haye been attained. The elcmentary facts of dcscriplive dieinistry, c!iosen with admirable judgment, are presented clc:trl!r : . ~ i i d intcrestiiigly. I < ~ - e nin the latter part, treating of the metals arid their conipouiids, material a p t to condense itself to a tedious cat:tlogue of substancc:s and properties, interest is well kept u p by judicious interpolatioii of applications and short digressions. The simplicity a11c1 directness of the language and its hold on the attention remind one 01 Professor Remsen's texts. The treatment of the theories is less praiseworthy. 'l'lie atomic theory is stated on pagc 62, immediately follon-ing t h e law of niilltiple proportions. The reviewer belie\.cs this theory slioultl be reached cautiously ~ ~dcfiinite s and multiple proand laboriously through not 0171y the 1 ~ 1 01 portions by weights, but also Gay Lussac's lan- of combiniiig volumes and Xvogadro's molecular tllcsory. 'l'liese 1;;ttc.r hiibjects arc riot colisidercd until pages 19.t and 226 rcspectivcly. The authors do riot insist c.nougii ilpon tl:c unccsrt:iint>- ilillerent in all theories. 011 t h e contrar!. t l l v y rc.pc:itc.fll\- 111:tl~ethe scrioils mistake of usiiig t :icor!. :is solitl, rocl
