8 CONTENTS. 
Page. 
Ciiapter V — Continued. 
Discussion - — 271 
Viscosity at zero 271 
Viscosity at high temperatures, kinetic inferences v 273 
Sources of error 274 
Diffusion 275 
Sliding coefficient 276 
Advantages of an exponential law 277 
Effect of imperfect gaseity - 279 
The new method of pyrometry 281 
Methods of computation , 281 
Eesults 282 
Transpiration not subject to the Poiseuille-Meyer law 284 
Objects of the investigation 284 
Hoffmann's researches 285 
Experimental results 287 
Transpiration under variable pressure „. 287 
Transpiration under constant pressure 288 
Transpirations compared differentially 293 
Discussion 295 
Apparent viscosity and pressure , 295 
Apparent viscosity and temperature 297 
Obliquity of the linear loci 297 
Supplementary results 298 
General remarks 300 
The new method of pyrometry 302 
Practical remarks 302 
Appurtenances 302 
The transpiration pyrometer 302 
(662) 
