634 
occurring with Calcite in Apophyl- 
lite in the, 426. 
Trap -rocks of Scotland, on the Chro- 
nology of the, 309, 453. 
Trees, on the Law of Growth in the 
Woody Circles of Exogenous, as 
indicated by a single Specimen, 
412. 
Troad, Excursions in the, with Obser- 
vations on its Topography and Anti- 
quities, 17, 41. 
Turner (William) on the Thyroid 
Gland in the Cetacea, with Observa- 
tions on the relations of the Thymus 
to the Thyroid in these and some 
other Mammals, 319. 
on the Secretion of the Human 
Pancreas, 425. 
and Dr Wilson on Chondra- 
canthus Lophii, 525. 
on the Structure of Lerneopoda 
Dalmanni, with Observations on its 
Larval Form, 569. 
Underground Temperature, on the Re- 
duction of Observations of, with Ap- 
plications to Prof. Forbes’s Edin- 
burgh Observations and the con- 
tinued Calton Hill Series, 342. 
■ Temperatures, on a me- 
thod of reducing Observations of, 
with its Applications to the Monthly 
Mean Temperatures, &c., 346. 
Vapour Densities at Low Tempera- 
tures, on a Method of taking, 395. 
Varnish, black lustrous, of ancient 
Pottery, 65. 
Vatican Manuscript, some Remarks on 
the Roman Edition of the, 160. 
Vegetable Formations in Calcareous 
Spar, 615. 
Vibrations produced by Electricity, 
Note on certain, 151. 
Vitrified Forts, on the Composition of 
the glassy Surface of some, 338. 
Volcanic (Carboniferous) Rocks of the 
basin of the Forth, 582. 
Volcanic Phenomena in Iceland, Na- 
tural History of, 387. 
Wanklyn (J. A.) on Zinc-methyl, 315. 
■ and Prof. Lyon Playfair on a 
Method of taking Vapour Densities 
at Low Temperatures, 395. 
and Prof. Tait on Electricity 
developed during Evaporation, and 
during Effervescence, from Chemi- 
cal Action, 544. 
and Dr Erlenmeyer on the 
Constitution of Mannite, 565. 
Water, on the recent Vindication of 
the Priority of Cavendish as Dis- 
coverer of the Composition of, 
205. 
Water and Steam, Thermic Properties 
of, 621. 
Waves of the Sea, on the destructive 
Effects of, on the north-east Shores 
of Shetland, 200. 
Whales, on the Capture of, with the 
aid of Poison, 270. 
Whytt (Robert, M.D.) Memoir of, 
570. 
Wilson’s (Prof. George) Biographi- 
cal notice of Prof. Edward Forbes, 
99. 
on the recent Vindication of 
the Priority of Cavendish as Dis- 
coverer of the Composition of 
Water, 205. 
(Dr H.) and Mr Turner on 
Chondr acanthus Lophii , 525. 
on Lerneopoda Dalmanni, 
with Observations on its Larval 
Form, 569. 
Wise (Dr) on the Form and Origin of 
the Symbols on the ancient sculp- 
tured Stones of Scotland, 73. 
Wright (Dr Strethill) on the Behavi- 
our of Mercury as an Electrode, 170. 
Zinc-methyl, on, 315. 
Zoological Classification and the 
Parallelism of the Mammal, Mar- 
supial, and Ornithic Classes, 423. 
END OF VOLUME FOURTH. 
PRINTED BT NEILL AND COMPANY, EDINBURGH, 
