408 
POPULAR SCIENCE REVIEW. 
followed by remarks on the use of magnetical instruments, by Professor 
Adams and Captain Evans. Meteorology is divided between Mr. R. Scott 
and Professor Stokes, the latter having given some notes on Auroral obser- 
vations. Electricity is taken up by Sir W. Thomson, who gives valuable 
advice concerning the mode in which atmospheric electricity is to be ob- 
served and recorded. Optics is divided between Professor Stokes, who tells 
how observations are to be made on the spectrum of the sun and of the 
Aurora, Mr. Spottiswoode, who has to do with the polarisation of light, 
and Mr. J. N. Lockyer, who gives instructions on the use of the spectro- 
scope. Under the title of “ Miscellaneous Information,” Dr. Rae dilates on 
saline matter in ice, though his views do not quite accord with those of 
other observers. Indeed, on this interesting point the reader can do nothing 
better than carefully peruse Dr. Walker’s admirable ice-observations, which 
were published in the “Journal of the Royal Dublin Society,” 1860, and 
are to be found in the present volume, at p. 640. In conclusion, we may 
mention Dr. Tyndall’s observations, which are of considerable import. 
The Biological portion of the “ Instructions ” first include Zoology. 
Under this heading we have papers by Dr. A. Gunther on collecting speci- 
mens of mammalia and fishes, and making observations thereon ; on the 
cetacea, by Professor Elower ; on the birds, by Dr. Sclater ; on the mollusca, 
by Mr. Gwyn Jeffreys ; on the collection of hydroids and polvzoa, and on 
the method of using the towing net, by Dr. Allman ; and, finally, one of the 
best papers is that by Professor Huxley, which contains supplementary in- 
structions, and gives some useful hints as to modes of obtaining unusual 
forms, which otherwise would have been overlooked. Dr. J. D. Hooker has 
sole charge of the botanical instructions, and no one could have been selected 
more thoroughly qualified for the task, and he has availed himself of the 
experience of Dickie and of Archer in particular departments, and thus made 
his portion of the instructions most valuable reading. Lastly, the geology 
and mineralogy has been here done by Professor Ramsay, Mr. Evans, Pro- 
fessor Maskelyne, and Mr. J. W. Judd. These portions are well illustrated, 
and cover nearly 16 pp. with excellent advice to the student. It will be 
seen that up to this we have been only considering the subjects of advice to 
the students who are to follow out the several departments. Besides this, 
there are about 750 pp. of articles on the various subjects connected with 
Arctic discovery. To enumerate these, merely giving the titles of the 
several papers and their authors’ names, would occupy nearly as many pages 
as we are accustomed to give to our entire reviews — i.e. about 10 pp. It is, 
therefore, alone requisite to state that all are of interest, and that some of 
the most old are unquestionably some of the best papers in the volume. In 
conclusion, we must express our opinion that our nation owes its thorough 
gratitude to the men who have at such a vast labour given their undivided 
experience for the immediate advantage of our polar navigators, and, there- 
fore, in the end for the benefit of our people. 
