224 
Patterson (R.) on medusz, 142. 
Peat, on some varieties of, 83. 
Peebles (Mr.) on the expressibility of 
the roots of algebraic equations, 54. 
Pelonaia, a new genus of ascidian 
mollusca, 137. 
Penny (Prof. F.) on a new salt ob- 
tained from iodine and caustie soda, 
80. 
—— on the action of nitric acid on the 
chlorates, iodates, and bromates of 
potassa and soda, 79. 
Perry (Dr.) on the circumstances 
which govern local inflammation, 
the effusion of coagulable lymph, 
and the formation of pus, 159. 
on the laws which govern con- 
tagious fevers, 160. 
Perth, on the meteorology of, 56. 
Pertussis, treatment of, by cold wash- 
ing of the chest, 158. 
Phenomena, voltaic, on a peculiar 
class of, 86. 
Phillips (John), new experimental re- 
searches on rain, 45. 
Phillips (Sir T.) on the minutely fila- 
mentous roots of the beech, 149. 
Photogenic drawing, on a new method 
of, 71. 
Physics, 1. 
Plants, South African genera of, syn- 
onyms and affinities of some, 147. 
Playfair (Dr. L.) on anew fat acid, 76. 
Pleistocene tract in the Isle of Man, 
104. 
Plum, anomalous form of the, in the 
gardens of New Brunswick, 148. 
Poisons, 72. i 
Pollen and vegetable impregnation, on 
the, 144. 
Porter (Mr.) on pawnbroking in Ire- 
land, 181. 
Potassa and soda, action of nitric acid 
on the chlorates, iodates, and bro- 
mates of, 79. 
Powell (Prof.) on an experiment of 
interference, 14. 
on a point in the wave theory as 
applied to heat, 14. 
Pus, formation of, 159. 
Railways, ceconomy of, in respect of 
gradients, 193. 
, timber bridges in reference to, 
195, 197. 
INDEX II. 
Railway, safety rotation, 196. 
Rain, excessive falls of, 45. 
——,, experimental researches on, 45. 
, formation of, 47. 
Rainbows, remarkable, 12. 
Rain gauge, improved, 210. 
, new, 211. 
Ramsay (A. C.) on the geological 
model maps and sections of the 
island of Arran, 92. 
Ravenstein (M. A.) on relief maps, 
122. 
Rayners (Mr.) on a machine regula- 
tor, 209. 
Read (Dr. J.) on the iriscope, 14. 
Redfield (W. C.) letter from, to Sir 
J. F. W. Herschel, on American 
storms and tornadoes, 40. 
Redtenbacher (Prof.), and Dr. Varren- 
trapp on the constitution and pro- 
ducts of the distillation of fat bodies, 
76. 
Rees (Dr.) on the preservation of sub- 
jects for anatomical purposes, 156. 
Regulator, machine, 209. 
Reid (Col.), letter from, to Sir David 
Brewster, on the appearance of the 
sun at Bermuda, 10. 
Reid (Dr. John) on the manner in 
which the vital actions are arrested 
in asphyxia, 151. 
on the anatomical relation of the 
blood vessels of the mother to those 
of the foetus in the human species, 
153. 
on the anatomy of the medulla 
oblongata, 154. 
on the connexion between the 
nervous system and muscular con- 
tractibility, 155. 
Richardson (Mr.) on the state of | 
crime in the district of Gorbals, 177. 
Ritchie (Mr.) on warming and venti- 
lating buildings, 214. 
Robinson (Rev. Dr. E.) on the Wadi 
el’ Arabah, in Syria, 121. 
Robb (Dr. J.) on certain geological 
features of the river St. John, in 
New Brunswick, with an account 
of the falls upwards from the sea, 
which occur near its embouchure in 
the Bay of Fundy, 115. 
onan anomalous form of the plum 
observed in the gardens of New 
Brunswick, 148. 
