178 
POPULAR SCIENCE REVIEW. 
objects of which is to show the reader how to see for himself the leading- facts 
of geology. With this view the author in the first three chapters gives the 
preparation for the study, the kind of apparatus required, the mode of in- 
vestigation in the field, and the method of determination of yocks, assisted 
by their microscopical examination. After noticing the nature of the oldest 
rocks, the formations, from the Cambrian to the Recent period, are successively 
described. Each chapter is complete in itself, and contains a clear and readable 
description of the occurrence, lithological structure, divisions, and principal 
life-forms of the strata noticed, together with brief allusions to their economic 
bearings and effects upon scenery. Throughout, the subject-matter is con- 
cisely treated, and this little manual will form a serviceable guide to the 
geological classes for whom it was more especially intended. Some slight 
corrections may be found necessary ; and the illustrations would have been 
more instructive if they had been more carefully executed. 
T the first glance we were inclined to say of this book, u Here is another 
unsatisfactory outcome of the voyage of the ‘ Challenger,’ ” the first 
chapter or two seemed so tame and jejune. On reading further, however, it 
appeared that this was due, in part at any rate, to the fact that the wind 
had been taken out of Mr. Moseley’s sails by Sir Wyville Thomson’s prior 
publication, relating to the voyage in the A tlantic, and perhaps in part to the 
fact that the author had not got thoroughly warmed up to his work, for lie 
tells us in his preface that the greater part of his narrative was written n 
board the ship, and “ sent home from the various parts touched at, in the 
form of a journal.” Later on, indeed immediately after the departure from 
the West Indies, the author apparently takes a fresh start, and the remainder 
of his book is so good that, although we cannot quite endorse the opinion of 
some critics who place it on a level with the admirable “ Journal of Re- 
searches ” of Charles Darwin, it may certainly be characterised as one of the 
best records of scientific travel that Ave possess. 
Leaving the details of the dredgings and deep-sea soundings which consti- 
tuted the principal business of the “ Challenger’s ” voyage to other hands for 
description, Mr. Moseley records the general incidents of the voyage, and his 
impressions of the localities visited, but intersperses these with many ex- 
ceedingly interesting and valuable observations on various subjects of natural 
history. Among these scientific notes marine objects, of course, occupy a 
considerable space, but the author’s remarks relate to a greater extent to the 
productions of the land, and as the ship in the course of her four years’ 
wanderings touched at a great number of out-of-the-way places, Mr. Moseley 
has been enabled to make many valuable additions to our stock of natural 
history information. 
* u Notes by a Naturalist on the 1 Challenger ’ : being an Account of 
Various Observations made during the Voyage of H.M.S. ‘Challenger’ 
round the World, in the years 1872-76.” By II. N. Moseley, M.A., F.R.S. 
8vo. London : Macmillan. 1879. 
THE “ CHALLENGER’S ” VOYAGE.* 
