Xll 



The Higher Theory of Elliptic Integrals, treated from Jacobi's Func- 

 tions as its basis. By F. W. Newman, Esq., M.A., Professor of 

 Latin in University College, London .................... page 704 



On the Comparison of Hyperbolic Arcs. By C. W. Merrifield, Esq. 708 



On the Oxidation of Glycol, and on some Salts of Glyoxylic Acid. 

 By H. Debus, Ph.D., ....................................... 711 



On Colour-Blindness. By William Pole, Esq ................... 716 



On the Construction of Life-Tables ; illustrated by a New Life-Table 

 of the Healthy Districts of England. By William Fan*, M.D., 

 F.R.S., Superintendent of the Statistical Department, General 

 Register-Office .......... ' .................................. 717 



On the means by which the Actiniae kill their Prey. By Augustus 

 Waller, M.D., F.R.S., Professor of Physiology in Queen's College, 

 Birmingham. In a Letter to Dr. Sharpey, Sec. R.S ........... 722 



On the Double Tangent of a Plane Curve. By Arthur Cayley, 

 Esq., F.R.S ............................................... 724 



On the Action of Acids on Glycol. By Dr. Maxwell Simpson ...... 725 



ERRATA. 



Page 538. Mr. Babbage waa of the year next below Sir J. Herschel and Dr. 

 Peacock not of the same year, as stated in the text. 



Page 584, line 10, for Dec. 19 read Dec. 9. 



Page 632, line 2, for 137 yards read 274 yards. 



Page 651, line 8, for No. V. read No. IV. 



Page 718, line 10 from bottom, for b a read l x . 



Page 719, line 4 from top, for dyymr x dz read dy=ymv K dz. 



Page 721, line 7 from top, for y read Y. 



