[ ] 
XII.  On  the  Action  of  Ammonia  on  Glyoxal.  By  Dr.  H.  Debus.  Communicated  hy 
Professor  Tyndall,  F.B.S 
XIII.  On  some  Physical  Pro])erties  of  Ice.  By  John  Tyndall,  F.B.S..  Professor  of 
Natural  Philosojyhy  in  the  Boyal  Institution  of  Great  Britain 211 
XIV.  Researches  on  the  Intimate  Structure  of  the  Brain,  Human  and  Corajparative. — 
First  Series.  On  the  Structure  of  the  MeduUa  oblongata.  By  J.  Lockhaet 
Claeke,  Esq.,  F.B.S 231 
XV.  On  the  Megatheeium  (Megatherium  Americanum,  Cityiee  and  Blumenbach). — 
Part  IV.  Bones  of  the  Anterior  Extremities.  By  Professor  Owen,  V.P.B.S., 
Swperintendent  of  the  Natural  History  Departments  in  the  British  Museum.  261 
XVI.  On  the  Anatomy  and  Physiology  of  the  Spongiadee.  By  J.  S.  Boweebank,  LL.D., 
F.B.S.,  F.B.S.  &G ' 279 
XVII.  On  the  Physical  Structure  of  the  Old  Bed  Sandstone  of  the  County  of  Wateaford, 
considered  with  relation  to  Cleavage,  Joint  Surfaces,  and  Faults.  By  the  Bev. 
Samuel  Haughton,  M.A.,  F.G.S.,  Fellow  of  Trinity  College,  and  Professor  of 
Geology  in  the  University  of  Dublin.  Communicated  by  Professor  Tyndall, 
F.B.S ' 333 
XVIII.  On  the  Relative  Power  of  Metals  and  Alloys  to  conduct  Heat. — Part  I.  By 
F.  Ceace  Calveet,  Esq.,  F.C.S.,  Corr.  Mem.  Boy.  Acad.  Turin,  Societe  de  Phar- 
macie,  Paris,  &c. ; and  Kichaed  Johnson,  Esq.,  F.C.S.  &c.  Communicated  by 
Professor  Stokes,  Sec.  B.S. 349 
XIX.  On  the  Thermo-electric  Series.  By  Augustus  Matthiessen,  Ph.D.  Communicated 
by  Chaeles  Wheatstone,  Esq.,  F.B.S. 369 
XX.  On  the  Electric  Conducting  Power  of  the  Metals.  By  Augustus  IVDlTthiessen,  Ph.D. 
Communicated  by  Chaeles  Wheatstone.  Esq.,  F.B.S. 383 
XXI.  On  the  Resistance  of  Tubes  to  collapse.  By  William  Faikbaien,  Esq.,  C.E., 
F.B.S.  &c 389 
XXII.  A Fourth  Memoir  upon  Quantics.  By  Aethue  Cayley,  Esq.,  F.B.S.  . . 415 
XXIII,  A Fifth  Memoir  upon  Quantics.  By  Aethue  Cayley,  Esq.,  F.B.S.  . . 429 
XXIV.  On  the  Tangential  of  a Cubic.  By  Cayimy,  Esq.,  F.B.S.  . . . 461 
XXV.  Astronomical  Experiment  on  the  PeaJc  of  Teneriffe,  carried  out  under  the  sanction 
of  the  Lords  Commissioners  of  the  Admiralty.  By  Professor  C.  Piazzi  Smyth. 
Communicated  by  G.  B.  Aiey,  Esq.,  Astronomer  Boyal 466 
XXVI.  On  Curves  of  the  Third  Order.  By  the  Rev.  Geoege  Salmon,  Trinity  College, 
Dublin.  Communicated  by  Aethue  Cayley,  Esq.,  F.B.S 535 
