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NATURE 
[SEPTEMBER 4, 1913 
HYDRAULIC MACHINERY. 
Modern Pumping and Hydraulic Machinery: 
Being a Practical Handbook for Engineers, 
Designers, and Others. 
+473. (London: C. Griffin and Co., 
1913.) Price r8s. net. 
N examination of this important work brings 
home to the reader some idea of the enor- 
mous extent and ever-increasing variety of 
machinery that is used in connection with 
hydraulics; for, although this treatise is devoted 
to the consideration of the wide range of machinery 
and appliances connected with almost every known 
type used in pumping operations, the amount of 
other classes of hydraulic machinery which the 
exigencies of space excluded would well fill the 
pages of another volume. For this reason the 
subtitle is too comprehensive and rather mislead- 
ing, as the book does not deal with hydraulic 
machinery ‘‘as applied to all purposes ”; but, it is 
fair to say, the author has wisely restricted its 
scope to enable him to deal comprehensively with 
the sections selected, and in a broad way included 
in the title “pumping machinery.” The ground 
chosen has been covered in an exhaustive and 
systematic way, and a glance at the contents 
shows how varied is the machinery dealt with, 
for it embraces machinery used for water-supply, 
wells, mines, drainage, irrigation, dredging, re- 
clamation work, and for raising petroleum from 
deep wells, and a chapter is devoted to hydraulic 
power wheels and turbines. 
There is no lack of admirable’ books on the 
theory of hydraulics and of hydraulic machines, 
but the many important developments and im- 
provements made in hydraulic machinery in recent 
years have doubtless created a demand for just 
such a book as Mr. Butler has so ably produced, 
and the information it contains cannot fail to be 
of use to the practical engineer and others engaged 
either in the construction or application of 
hydraulic machinery, to say nothing of its educa- 
tional value to the engineering student. The 
designer will also appreciate the book, as it con- 
tains a wealth of detail and descriptive matter, 
but his requirements as to the proportioning of 
parts have not received the attention they might 
with advantage have had given to them here and 
there in a treatise of this type. No better work 
than Seaton’s ‘“‘ Marine Engineering ” can be cited 
as an example of what can be done in this direc- 
tion to help the designer. The Humphrey gas-dis- 
placement pump, the most important invention 
in pumping machinery made in recent years, is 
fully described, and the author gives some par- 
ticulars of previous inventions of this type, but 
omits to mention that the first-known internal com- 
2288, VOL. 92] 
Ltd., 
By E. Butler, Pp. xvi | 
| bustion pump was Tatham’s, patented about 1894, 
and referred to in the discussion on the Humphrey 
pump at the Institution of Mechanical Engineers. — 
The illustrations are extremely well reproduced, 
with few exceptions; for instance, the longitudinal 
_ sections on p. 387 look rather too confusing to be 
easily read, owing to their coarse section lining. 
; On the other hand, the diagram on p. 377, showing — 
development of vane curvature in an impeller 
wheel, is admirable. q 
The book is a notable addition to the literature 
of the subject, and should be well received. 
H. Jo 
MIND, HEALTH AND PURPOSE. 
(1) The Game of Mind: A Study in Psychological 
Disillusionment. By Percy M. Campbell. Pp. 
iii+80. (New York: Baker and Taylor Co., 
1913.) Price 75 cents net. ; 
(2) Mind and Health. With an Examination of 
some Systems of Divine Healing. By Dr. 
E. E. Weaver. With an Introduction by Dr. 
G. Stanley Hall. Pp. xv+500. (New York: 
The Macmillan Company; London: Macmillan 
& Co., Ltd., 1913.) Price 8s. 6d. net. : 
(3) Devalopiient and Purpose: An Essay ‘oman 
a Philosophy of Evolution. By Prof. L. T. 
Hobhouse. Pp. xxix+383. (London: Mac- © 
millan & Co., Ltd., 1913.) Price ros. net. 5 
“The Game of Mind” Mr. Campbell 
N 
I puts the question: “To what extent does 
the mere reiteration, by the possessor of a tooth- 
ache, of the complaint that he is indeed feeling 
pain, influence or constitute that pain? In other 
words, If the victim were so organised that he — 
need not perforce tell himself each instant that 
he is being hurt, would the hurt exist as such 
at all?” And Mr. Campbell replies: “We are 
convinced that it would not.” Mr. Campbell, of 
course, discusses many other questions; but his 
method of argument displays the same degree of 
cogency throughout. , 
(2) In “Mind and Health” Mr. Weaver dis- — 
cusses ‘‘some of the distinctive religious and 
philosophical systems of healing,” and lays down 
“the plan of a valid system of healing on re- 
ligious ground.” The first element of “a valid 
religious psychotherapy” he declares to be that — 
“sickness comes from want of goodness.” 
“Goodness ” is, of course, an ambiguous term; 
and Mr. Weaver very properly describes the 
sense in which he uses it: ““A goodness that starts © 
in the spiritual and will be allowed to work un- 
fettered and unhindered in the intellectual, emo- - 
tional, and physical life will not be sick. It knows 
no sickness.”” If goodness of this kind—a good- 
ness which knows no. sickness—is to be pro- 
