[The Copyright of Articles in this Fournal ts Reserved.) 
CONTENTS. "OF No. XLVIII,; 
ArT. PAGE 
I. ANIMAL DEPRAVITY ‘ ; , : ; : : has 
II]. THe Loncevity oF Brain-WorkeErs. By George M. Beard, 
A.M., M.D. F : 4 : “ : : 2 « (430 
III. On THE ConpDITION OF THE ATMOSPHERES OF THE PLANETS, 
By E. Neison, F-R.G:S., &c. .. . '. : : ; - 449 
IV. THe PosstBitity oF A Future LIFE . F : - 472 
V. THe CHANNEL TuNNEL. By F. C. Danvers, Assoc. Inst. 
GE. é : 5 : : - , : : . 486 
VI. Tue Arctic EXPEDITION oF 1875. By G. F. Rodwell, 
F:R.A.8., F.C.S. : 3 3 i 4 ? ; - 504 
NOTICES OF SCIENTIFIC WORKS. 
Helmholtz’s “Sensations of Tone as a Physiological Basis for 
the Theory of Music” . : : : . : « 524 
Tyndall’s ‘‘ Sound” 2 : ‘ , : , ; = 527 
Tyndall’s “ Six Lectures on Light mye : ; - 527 
Atkinson’s ‘‘ Natural aca for General Readers and Yours 
People”. : 528 
Irving’s ‘‘Short Manual of Heat, iss: the Use of schesis and 
Science Classes ” : ‘ 2 : : : 520 
Gordon’s ‘‘ Elementary Book on Heat ” ; - : - = 425 
