LIST OF ILLUSTRATIONS. 



MEMOIR OP HODGKINSON. 



Page. 



Trans. Strain and strenpjth of metals, Fig. 1 209 



Trans, strain and strength of metals, Fig. 2 209 



Trans, strain and strength of metals. Fig. 3 214 



Trans, strain and strength of metals, Fig. 4 214 



Trans, strain and strength of metals. Fig. 5 226 



PRINCIPLES OF THE MECHANICAL THEORY OF HEAT. 



Development of heat by mechanical means. Fig. 1 245 



Development of heat by mechanical means, Fig. 2 246 



Mechanical equivalent of heat, Fig. 3 249 



Mechanical equivalent of heat, Fig. 4 249 



Mechanical equivalent of heat, Fig. 5 251 



Mechanical eeiuivalent of heat, Fig. 6 252 



Mechanical equivalent of heat. Fig. 8 253 



Elements of the mechanical theory of heat, Y'lg. 9 260 



Application of the mechanical theory of heat to aqueous vapors, Fig. 10 263 



Application of the mechanical theory of heat to aqueous vapors, Fig. 11 266 



Action of saturated steam under expansion. Fig. 12 271 



Melting of ice. Fig. 13 273 



Melting of ice. Fig. 14.... 273 



Melting of ice. Fig. 15 273 



Melting of ice, Fig. 16 274 



Melting of ice, Fig. 17 274 



Melting of ice. Fig. 18 274 



Radiation, (one cut) 299 



Drilling in stone without metal, Fig. 1 ; 393 



Drilling in stone without metal, Fig. 2 393 



Drilling in stone without metal. Fig. 3 393 



Drilling in stone without metal. Fig. 4 394 



Drilling in stone witiiout metal, Fig. 5 395 



Drilling in stone without metal. Fig. 395 



Drilling in stone without metal. Fig. 7 396 



Drilling in stone without metal. Fig. 8 397 



Drilling in stone without metal. Fig. 9 398 



Drilling in stone without metal, I<"'ig. 10 399 



Drilling in stone without metal. Fig. 11 399 



Ancient stone axes 400 



Agricultural flint implements in southern Illinois, Fig. 1 401 



Agricultural flint implements in southern Illinois, Fig. 2 401 ■ 



Agricultural flint implements in southern Illinois, (plan of locality) 403 



Agricultural flint implements in southern Illinois, Fig. 3 404 



Agricultural flint implements in southern Illinois, Fig. 4 405 



