908 
I X D E X. 
L. 
Lavas,  structure  of,  703  (see  Lyell). 
Linear  transformations,  39  (see  Cayley). 
Lister  (Joseph).  An  Inquiry  into  the  parts  of  the  Nervous  System  which  regulate  the  contractions 
of  the  Ai’teries,  607. 
On  the  Cutaneous  Pigmentary  System  of  the  Frog,  627. 
On  the  Early  Stages  of  Inflammation,  645. — Aggregation  of  the  corpuscles  of  the 
blood,  647 ; structure  and  functions  of  the  blood-vessels,  653 ; efiects  of  irritants  upon  the  circu- 
lation, 658 ; efllects  of  irritants  upon  the  tissues,  678 ; conclusion,  698. 
Lyell  (Sir  Charles).  On  the  Structure  of  Lavas  which  have  consolidated  upon  steep  slopes,  703 
(for  contents,  see  pp.  703-705). 
M. 
Magnetic  induction  of  crystals,  543;  of  an  isotropic  ellipsoid,  554  (see  Plucker). 
Magnetometer  observations,  508. 
Matrices,  on  the  theory  of,  17. 
Matthiessen  (Dr.  Augustus).  On  the  Thermo-electric  Series,  369. 
. On  the  Electric  Conducting  Power  of  the  Metals,  383. 
Medulla  oblongata,  structure  of  the,  231  (see  Clarke). 
Megatherium,  on  the,  261. 
Mei'curic  methyl,  isolation  of,  163  (see  Buckton). 
Meteorological  observations  on  the  Peak  of  Teneriffe,  512. 
Moon  and  planets,  appearance  of,  from  a high  station,  483. 
O. 
Owen  (Professor).  Description  of  the  Skull  and  Teeth  of  the  Placodus  laticeps  (Owen),  with  indica- 
tions of  other  new  species  of  Placodus,  and  evidence  of  the  Saurian  nature  of  that  genus,  169. 
. On  the  Megatherium. — Part  IV.  Bones  of  the  Anterior  Extremities,  261. 
P. 
Partition  of  numbers,  47. 
Placodus  laticeps,  ^c.,  169  (see  Owen). 
Plucker  (Professor  Julius).  On  the  Magnetic  Induction  of  Crystals,  543. — Direction  in  which  biaxal 
crystals  set,  545;  three  axes  of  magnetic  induction,  547,  551,  554;  magnetic  axes,  550,  552,  554; 
on  finite  ellipsoids  influenced  by  an  infinitely  distant  pole,  554;  experimental  verification,  567; 
position  of  the  three  axes  of  magnetic  induction  with  regard  to  the  primitive  form  in  crystals 
belonging  to  different  systems,  580;  note  added,  584. 
Polarization  of  the  sky,  509. 
Polyedra,  on  the  theory  of,  145  (see  Kirkman). 
Pratt  (Archdeacon).  See  Clarke. 
Q- 
Quantics,  415,  429. 
