LIST OF CONTRIBUTORS. 77 



Johnson, Walter K. Continued. 



— ■ — ■ Some observations on the mechanical structure of coal, with 



evidences of the contemporaneous origin of its various kinds. 



j viii, 173 

 — - — Examination and analysis of coal, found in the province of 



Aranco, coast of Chili, thirty miles south of Bio Bio River. 

 J viii, 180 

 — On the relation between the coal of South Wales and that of 



some Pennsylvania anthracite. J viii, 195 

 — - Forms of coal. P '41, 4. 7, 73 



— Fossil whales. P '41, 5 



— Mechanical structure of coal. P '41, 9 



— Action of light. P '41. 16 



— On coal from Aranco, Chili. P '41, 21 



— On the magnetic phenomena attending the congealing of cast- 

 iron. P '41, 33 



— On the relation between the coal of South Wales and that of 



some Pennsylvania anthracites. P '41, 40 



— ■ Application of anthracite to the smelting of magnetic iron 

 ores. P '41, 42 

 - — Effect of conflagration on atmosphere. P '41, 45 



— Anthracite coal from Rhode Island. P '41, 118 



— Rotation of fluids. P '41, 121 



— Laws of chemical combination and of the combining volumes 



of gaseous substances. P '41, 127 



— ■ Spontaneous combustion of bituminous coal. P '42, 140 

 — ■ Magnetic bars of wrought iron broken by tensile force. 



P '42, 142 



— On decay of wood. P '42, 155 



— Composition of antharcite and bituminous coal. P '42, 156 



— Determination of copper. P '42. 187 



— Use of the galvanometer for testing sheathing copper after 

 exposure to the action of sea water. P '42, 210 



— Natural coke from Virginia. P '42, 220, 223 



— On Sydney bituminous coal. P '42, 220 



- — Niote on sugar resembling mannite. P '43, 244 



— Test of copper sheathing. P '42, 210 ; '43, 245 



— Note on cannel coal from Kentucky. P '43, 246 



— Observations of coal. P '44, 8 



— On plumbago mica, P '44, 74 



— On minerals from Mt. Washington. P '44, 89 



