456 
on p. 51 he cites as of great interest the observa- 
tion and experiment of Professor Roscoe, else- 
where noted, as to the extraction of a hydro- 
carbon from the ‘blue ground.’ These refer- 
ences alone would indicate Professor Lewis’ 
views, even apart from his own statement of 
them to the writer. 
Mr. Becker also alludes to the broken crystals, 
as repeatedly seen by him in separate frag- 
ments enclosed or embedded in the rock, and as 
not being considered rarities at Kimberley. 
These occurrences, however, may well be due 
to the very causes treated of by Professor 
Lewis in explaining the brecciated character of 
the rock (p. 54 and above noted), especially the 
first and third, the latter in particular, ‘ subse- 
quent explosions and movements in the crater’ 
below. Any such action sufficient to break up 
the Kimberlite into the likeness of a breccia 
would easily shatter the highly cleavable dia- 
mond crystals and bring about the condition 
seen and described by Mr. Becker. 
It may not be out of place here to recall an 
instance where, in another locality, the occur- 
rence of diamond may be connected with a 
similar outbreak of igneous rock through beds 
containing carbon. In a paper, ‘On Bohemian 
Garnets,’ read by me before the American 
Institute of Mining Engineers, and published in 
their Transactions for February, 1892, mention 
was made of a diamond crystal found in 1870 
at Dlaschkowitz, Bohemia, among a number of 
the pyrope garnets which are derived from the 
decomposition of peridotite rock. After being 
disputed and identified, it was deposited in the 
public museum at Prague, where I examined 
it, as well as the locality where it was found. 
The decomposed serpentinous rock has evi- 
dently been transported from the north (prob- 
ably by glacial action) and there are found, at 
a distance of twenty or thirty miles in that di- 
rection, basaltic outflows that have broken 
through the coal measures. Here, again, is a 
suggestion of similar conditions, and the occur- 
rence of this single crystal is not without in- 
terest in such a connection, as may be a Ural 
erystal at Chitanka, where I identified serpen- 
tine and pyrope, but not any carbonaceous ma- 
terials, as my time was very limited. 
It is a matter for national pride that this re- 
SCIENCE. 
[N.S. Von. VI. No. 142. 
markable investigation should have been made 
by an American scientist ; and a debt of grati- 
tude is due both to the great English meteor- 
ologist—the editor, Professor Bonney—for his 
labor of love, alike to science and to a deceased 
friend, and also to Mrs. Lewis, who has so care- 
fully sought to prepare and make public these 
papers of her brilliant and lamented husband. 
GEORGE F. Kunz. 
NEw YORK. 
NEW BOOKS. 
System der Bakterien. Dr. W.Mi1Guna. Jena, 
Gustav Fischer. 1897. Pp. viii;368 and 6 
plates. 
Manual of Bacteriology. Ropert Murr and 
JAMES RircHig. Edinburgh and London, 
Young Pentland; New York, The Mac- 
millan Company. 1897. Pp. xvi+519. $3.25. 
The Calculus for Engineers. JOHN PERRY. 
London and New York, Edward Arnold. 
1897. Pp. vi+878. $2.50. 
Theory of Electricity and Magnetism, CHARLES 
Emerson Curry. London and New York, 
The Macmillan Company. 1897. Pp. xvi+ 
449, $2.50. 
Organic Chemistry for the Laboratory. W. A. 
Noyes. Easton, Pa., Chemical Publishing 
Company. 1897. Pp. xi+257. $1.50. 
The Psychology of the Emotions. Tu. Ripor. 
London, Walter Scott, Ltd.; New York, 
Charles Scribner’s Sons. 1897. Pp. xix-+ 
455. $1.25. 
Hallucinations and Illusions. 
London, Walter Scott, Ltd.; New York, 
Chas. Seribner’s Sons. 1897. Pp. xiv+390. 
The New Psychology. E. W. SCRIPTURE. Lon- 
don, Walter Scott, Ltd.; New York, Chas. 
Seribner’s Sons. 1897. Pp. xxiv-+6500. 
$1.25. 
Introduction to Philosophy. OSWALD KULPE. 
Translated by W. B. PrLtsBuRY and E. B. 
TITCHENER. London, Swan, Sonnenschein & 
Co.; New York, The Macmillan Company. 
1897. Pp. x+256. $1.60. 
Volcanoes of North America. ISRAEL C. Rus- 
SELL. New York and London, The Macmil- 
lan Company. 1897. Pp. xiv-+346. $4.00. 
EDMUND PARISH. 
