INDEX, 
R. 
Radiation  from  the  sun  and  sky,  495 ; of  the  moon,  500. 
Refraction,  lateral,  494. 
Refraction  of  light,  influence  of  temperature  on  the,  887. 
Resistance  of  tubes  to  collapse,  389  (see  Fairbairn). 
Rue,  on  the  constitution  of  the  essential  oil  of,  199. 
S. 
Salmon  (Rev.  G.).  Calculation  of  Hermite^s  18-thic  Invariant  of  a Binary  Quintic,  455. 
. On  Curves  of  the  Third  Order,  535, 
Sandstone  [Old  Red)  of  the  County  of  Waterford,  333  (see  Haxjghton). 
Smyth  (Professor  C.  Piazzi).  Astronomical  Experiment  on  the  Peak  of  Tenerifle,  carried  out  under 
the  sanction  of  the  Lords  Commissioners  of  the  Admiralty,  465. — Introductory  matter,  465  ; 
deduced  improvement  of  astronomical  vision  with  height,  477 ; astronomical  observations  procured, 
482 ; physical  observations,  495 ; meteorological  observations,  512. 
Spectrum,  lines  in  the,  as  seen  from  a high  station,  503. 
SpongiadcR,  on  the  anatomy  and  physiology  of  the,  279  (see  Bowerbank). 
Stratification  of  electric  light,  1 . 
SturionidUe,  on  an  extinct  genus  of  the,  871. 
T. 
Teneriffe,  astronomical  experiment  on  the  Peak  of,  465  (see  Smyth). 
Thermo-electric  series,  on  the,  369. 
Tidal  observations  at  Teneriffe,  532. 
Tyndall  (Professor).  On  some  Physical  Properties  of  Ice,  211. — Note  from  Mr.  Faraday,  228. 
W. 
Waterford,  old  red  sandstone  of  the  county  of,  333  (see  Haughton). 
Williams  (C.  Greville).  On  the  Constitution  of  the  Essential  Oil  of  Rue,  199. 
Williams  (Dr.  Thomas).  Researches  on  the  Structure  and  Homology  of  the  Reproductive  Organs  of 
the  Annelids,  93. — Structure,  93 ; homology,  137. 
Z. 
Zodiacal  light,  490. 
LONDON: 
FEINTED  BY  TATLOE  AND  FEANCIS,  EED  LION  COUET,  FLEET  STEEET. 
