APRIL 26, 1901.] 
tions often required in connection with the 
analytical operations described, and has, where- 
ever these calculations are at all complicated, 
indicated the method of procedure. Tables 
to assist in the calculation of analyses are also 
appended. 
References to the original sources of informa- 
tion are uniformly and freely given. Many 
of these refer to articles published in 1900, in- 
dicating that the book has been brought well 
up to date. The book closes with an excellent 
subject and author index, and the typography 
throughout is very satisfactory. 
Professor Classen presents, as a product of 
thirty years of analytical practice in connec- 
tion with technical chemistry, a work which 
bears evidence of a high degree of trustworthi- 
ness and is, to the extent to which it has been 
finished, of an unusual degree of completeness. 
As would have been expected, considerable 
stress is placed upon electrolytic methods and 
their advantages, and the omission of certain 
methods which are known to be reliable may 
cause some surprise; but there can be no doubt 
that the work is a distinctly valuable addition 
to the literature of analytical chemistry, and is 
sure to be of great service. Its early comple- 
tion is much to be desired. 
H. P. TALBOT. 
SCIENTIFIC JOURNALS AND ARTICLES. 
In the February-March number of the Jour- 
nal of Geology Thomas lL. Watson discusses 
‘The Origin of the Phenocrysts in the Porphy- 
ritic Granites of Georgia.’ Detailed descrip- 
tions of the rocks of various districts are given. 
The criteria for distinguishing phenocrysts 
formed in place from those of intratelluric 
origin are stated and the conclusion is drawn 
that these were undoubtedly formed in place. 
Under the title of ‘Certain Peculiar Eskers 
and Hsker Lakes of Northeastern Indiana,’ 
Charles R. Dryer describes some interesting 
results of deposition by glaciers or glacial 
waters which he does not attempt to fully 
explain. Good contour maps are given which, 
with the data furnished, will bear study. 
‘Correlation of the Kinderhook Formations of 
Southwest Missouri’ is discussed by Stuart 
Weller. A recent State report makes a part of 
SCLENCE. 
661 
these rocks Devonian and supposes the section 
to be poor in fossils, Mr. Weller has collected 
many fossils from the area and gives in detail 
the evidence upon which he definitely corre- 
lates all the beds with the Chouteau limestone 
of central Missouri which is Upper Kinder- 
hook. F. W. Sardeson concludes the discus- 
sion of ‘The Problem of the Monticuliporoidea’ 
begun in the last number. O. C. Farrington 
contributes a second article on ‘ The Structure 
of Meteorites,’ giving a detailed description of 
the chondritic structure. An interesting con- 
clusion gives an account of the synthetic 
experiments by which it has been attempted 
to reproduce the structural details of meteor- 
ites. Success in this line has not been marked, | 
and it may be necessary to fall back upon extra- 
terrestrial conditions. The intense cold of 
space is suggested. 
In The Auk for April P. B. Peabody describes 
the ‘Nesting Habits of Leconte’s Sparrow,’ 
and William Brewster notes ‘The Occurrence, 
in Massachusetts, of Certain Rare or Interest- 
ing Birds,’ and Frank Coates Kirkwood tells of 
‘The Cerulean Warbler (Dendroica ceru- 
lescens) as a Summer Resident in Baltimore 
County, Maryland.’ Joseph Grinnell describes 
‘Two Races of the Varied Thrush’ and J. 
Lewis Bonhote has some notes ‘On a Collec- 
tion of Birds made by Mr. T. R. Thompson at 
the Cay Lobos Lighthouse, Bahamas’ ; and 
Otto Widmann contributes an article on ‘A 
Visit to Audubon’s Birthplace,’ Fontainbleau 
Plantation, near Mandeville, La.; the house is 
now inruins. Reginald Heber Howe, Jr., has 
‘A Study of the Genus Macrorhampus’ deciding 
that M. scolopaceus is but a subspecies of M. 
griseus. H. W. Henshaw notices ‘Birds of 
Prey as Ocean Waifs,’ and Francis J. Birtwell 
gives ‘A Description of a Supposed New 
Subspecies of Parus from Mexico.’ Hubert 
Lyman Clark discusses ‘The Pterylosis of Pod- 
argus, with Notes on the Pterylography of the 
Caprimulgi,’ concluding that the nearest rela- 
tives of this group of birds are to be sought for 
among the nocturnal birds of prey. There is 
a ‘Republication of Descriptions of New Species 
and Subspecies of North American Birds, No. 
Il.’ by J. A. Allen, Wilfred H. Osgood describes 
