388 



INDEX. 



Spectral impressions, their apparent im- 

 mobility discovered by Dr Wells, and 

 not by Mr Charles Bell, 147. 



Spider, domestic one, possesses a natural 

 diving-bell. 145. 



Springs, on the temperature of, in Corn- 

 wall, 75. 



Stars, double, catalogue of, 281. 



Steam-boat, Enterprise, for India, 377- 



Steam-boats, number for the Clyde, 187- 



Steam-Engines, number of, in Glasgow, 

 187. 



Steel plates, menstruum for biting in upon 

 them, 347- 



Stickleback, account of one found alive 

 in the intestines of a leech, 74. 



Strata, on the consolidation of the, 1. 



Strength of materials, observations on 

 the, 351. 



Sulphate of potash, its composite struc- 

 ture, not discovered by Mr Brooke, 147. 



Syphon, moveable branch one invented 

 by Mr Bryce, described, 140," 



Targionia hypophylla found in Scotland, 

 183. 



Temperature of the gulf- stream, 257 — 

 highest and lowest, on the earth's sur- 

 face, 181. 



Thorn, Mr R., on a single valve-sluice, 

 154— on a chain-sluice, 155 — on a 

 single weather one, 343'. 



Tides, table of their rise at Hobart 

 town, 100. 



Tredgold on the construction of chim- 

 neys, 349. 



Triangle for elevating the jet of fire-en- 

 gines, 149. 



Turner, Dr Edward, his analysis of a 

 mica from Cornwall, 137 — of lithion 

 mica, 201 — of different minerals, 300 

 — of Edingtonite, 318. 



Van Houten, on a breathing-pump, 150. 



Vision, on the phenomenon of indirect, 

 289 — how affected by weak light, 290. 



Walrus, on the structure of its hind-foot, 

 140. 



Waterspouts, observations on, 181. 



Well, remarkable explosion of gas in one, 

 108. 



Withamitc, 183. 



Yttria, phosphate of, 32?. 



Zembla, Nova, discoveries in, 185. 



Zinc ores, analysis of, 310. 



Zoological collections, 143, 334. 



DESCRIPTION OF PLATES IN VOL. III. 



PLATE I. 



PLATE II. 



PLATE III. 



PLATE IV. 

 PLATE V. 

 PLATE VI. 



PLATE VII. 



PLATE VIII. 



Figs. 1. and 2. Diagrams explaining the explosion of Oil Gas at 



Edinburgh. 

 Fig. 3. Detached Block of Stone at Dunkeld. 

 Fig. 4. Mr Lecount's method of giving the Epicycloidal form to the 



Teeth of Wheels. See this No. p. 340. 

 Kig. 5. Mr Shiells' Triangle for directing the Jet of Fire-Engincs. 

 Fig. 6. Dr Dyce's improved Hydropneumatic Lamp. 

 Fig. 7. Diagram illustrative of the Expansive power of Liquids 

 Fig. 8. Plan and Section of a Rail-Road of Granite. 

 Fig. 9. Mr Thorn's Single Valve-Sluice. 

 Fig. 10. Mr Thorn's Chain-Sluice. 

 Fig. 1 1. and 1 2. Van Houten's Breathing Pump. 

 Fig. 13. and 14. Figures of the Effect of Mirage. 



15. — 22. Amici's improvements on the Camera Lucida. 



1. Head of the Fossil Elk, in the possession of Mr Burman. 



2. Part of Chaloner's Map of tire Isle of Man in 1G5G. 



3. Head of the Irish Fossil Elk. 



4. Diagram respecting the Strength of Timber. Sec this No. 

 351. 



Is illustrative of Mr Haidinger's paper, on the regular Composi- 

 tion of Crystals. 



Is a Representation of M. Blanken's Fan-Gate Sluice. 



A portion of the Rocks on the banks of the Carity. 



Is illustrative of the Article on Mechanical Inventions, &c. &C. &c. 

 p. 340. 



Is illustrative of Mr Haielingcr's papers on the genus Gypsum- 

 Ilaloide and on Edingtonite 



Contains figures of a species of Cephalopterus, the Abranchus 

 Alleghanienses, Menobranchus lateralis, and Chlamyphorus 

 rruncalus. 



Fig- 

 Fig 

 Fig 

 Fig. 

 Fig. 

 P- 



