INDEX I. 
ib.; remark on periodic, from Prof. Sil- 
liman’s Journal, 131. 
Moggeridge (Matthew), registration of pe- 
riodic phenomena kept by, at Swansea, 
350. ‘ 
Mollusca nudibranchiata, 241; cepha- 
lopoda, ἐδ. ; ascidia, 2b. ; bryozoa, 242. 
Mollusca obtained by dredging :—species 
of testaceous, 200, 220; in Vigo Bay, 
264; Cascales Bay, 269; Cape St. 
Mary’s, ib. ; Cadiz and Cape Trafalgar, 
272, 273; Gibraltar, 275; Malaga, 
280; Carthagena, 282; Bay of Al- 
giers, 284; Golotta, near Tunis, 287 ; 
Tunis Bay, 288 ; island of Zembretta, 
2b. ; island of Pantellaria, 291 ; Malta, 
293, 294; Syracuse and Catania, 296 ; 
Port of Messina, 298; Bay of Naples, 
ib.; Gulf of Cagliari, 299; Mahon, 
301; Conijera, near Cabrera, 303. 
Ninfield, registration of periodical phx- 
nomena at, 356. 
Paludicella, -337 ; muscular system of, 
316. 
Penmanshiel, registration of periodical 
phenomena at, 344. 
Phenomena, periodical, on the registra- 
tion of, 338. 
Plants, on the influence of carbonic acid 
gas on the health of, 159; taken by 
the dredge, 246; on the registration of 
the periodical phenomena. of, 338 ; list 
to be observed for the periods of folia- 
tion and defoliation, 2b. ; for the flower- 
ing and ripening of the fruit, 339; at 
the vernal and autumnal equinoxes and 
summer solstice, for the hours of open- 
ing and closing their flowers, 341. 
Plumatella, 330; new species, 335, 336. 
Polyzoa, on the present state of our 
knowledge of the freshwater, 305 ; de- 
finition of terms in the anatomy of, 
307 ; dermal system, ἐδ. ; organs of 
digestion, 309; species with bilateral 
and orbicular lophophore, 309, 311, 
315; histology of alimentary canal, 
310; organs of respiration and circu- 
lation, 312; muscular system, 314; 
organs of the life of relation, 319 ; em- 
bryology of, 320. 
Portugal, on the distribution and range 
in depth of mollusca and other marine 
animals observed on the coast of, 264. 
Powell (Professor), suggestions for the 
observation of the total eclipse of the 
sun on July 28, 1851, 361; on obser- 
195 
vations of luminous meteors, 89; ap- 
pendix, 104. 
Ronalds (Francis), report concerning the 
Observatory of the British Association 
at Kew, Sept. 12, 1849, to July 31, 
1850, 176. 
Scotland, analysis of dredging papers 
drawn up on the W. and N. coasts of, 
212. 
Seeds, experiments on the growth and 
vitality of, 160; general summary of, 
from 1841 to 1850 inclusive, 162. 
Seismometer, on the completion of a self- 
registering, 88. 
Sladen (Edward H. M.), registration of 
periodic phenomena kept by, at Nin- 
field, 356. 
Solar radiation, on the present state of 
our knowledge of the chemical action 
of the, 137 ; list of bodies susceptible 
of chemical change under the influence 
of the, 150; list of authors of papers 
on magnetism induced by, 153. 
Spain, on the distribution and range in 
depth of mollusca and other marine 
animals observed on the coast of, 264. 
Stars, shooting, M. Coulvier Gravier on, 
104 ; seen at Kew Observatory, 106. 
St. Michael’s, results of meteorological 
observations taken at, from Jan. 1, 
1840 to Dec. 31, 1849, 133. 
Strickland (H. E.), tenth report on the 
growth and vitality of seeds, 160. 
Struve (M. Otto), suggestions for the ob- 
servation of the total eclipse of the sun 
on July 28, 1851, 361. 
Sun, suggestions for the observation of 
the total eclipse of the, on July 28, 
1851, 361. 
Swansea, registration of periodical phe- 
nomena at, 350. 
Vegetable juices, remarkable action of 
the spectrum on, 149. 
Vertebrata and land animals, traces of, 
taken by the dredge, 247. 
Waves, on the instrumental admeasure- 
ment of earthquake, 88. 
Williams (Dr. Thomas) on the structure 
and history of the British annelida, 
133. 
Zoology, on the investigation of British 
marine, by means of the dredge, 192. 
Zoophyta, 245. 
Ge 
