X 



On Furfuraniline and Furfurtoluidine. By John Stenhouse, LL.D., F.R.S. 537 



On Parasulphide of Phenyl and Parasulphobenzine. By John Stenhouse, 

 LL.D., F.R.S., &c 542 



On a Method of graphically representing the Dimensions and Proportions 

 of the Teeth of Mammals. By George Busk, F.R.S 544 



Note on the Spectra of Erbia and some other Earths. By William Hug- 

 gins, LL.D., F.R.S c . 546 



On the Values of the Integrals j Q n , Q»-, dp, Q n , Q„- being Laplace's Co- 

 efficients of the Orders n, n , with an application to the Theory of Radia- 

 tion. By the Hon. J. W. Strutt, Fellow of Trinity College, Cambridge. 553 



Note on the Construction of Thermopiles. By the Earl of Rosse, F.R.S. . 553 



Index * 557 



Obituary Notices of Fellows deceased : 



Jean Victor Poncelet i 



Nathaniel Bagshaw Ward ii 



Mr. Robert Porrett iv 



Carl Friedrich Thilipp von Martins vi 



General Thomas Perronet Thompson xi 



Thomas Graham xvii 



Marie-Jean Pierre Flourens xxvii 



Peter Mark Roget xxviii 



ERRATA. 



Vol. xvi. page 346, line 8 from bottom, for instead of a depth read in seas of a depth. 

 „ xvii. „ 345, line 8 from bottom, for £N = — 157"' 156 read £N = -|-157" , 156. 

 ,, xviii. „ 207, line 10 from bottom, before and after the words " Stream-lines 

 generated by a Sphere," dele the marks of quotation. 



NOTICE TO BINDER. 

 Plate II. to face p. 352. Plate III. to face p. 350. 



