Vlil CONTENTS. 



Page 



Existence of a limit to vaporization 1 91> 



Limits of vaporization 205 



Fluidity of sulphur at common temperatures 212 



Fluidity of sulphur and phosphorus at common temperatures .... 213 



Perspective aerial light and shadow 215 



Confinement of dry gases over mercury 217 



Decomposition of hydrocarbons by expansion 219 



Transference of heat by change of capacity in gas . . 221 



Labarraque's disinfecting soda liquid 222 



Anhydrous sulphate of soda . 230 



Manufacture of optical glass 231 



Peculiar class of optical deceptions 291 



Sound during the conduction of heat 311 



i Peculiar class of acoustical figures 314 



Preparation of the lungs for holding the breath 358 



Ventilation of lighthouse lamps 362 



Thoughts on ray-vibrations 366 



On ice and freezing water 372 



On regelation , 377 



Table-turning 382 



Relations of gold and other metals to light 391 



Conservation of force 443 



Lecture on mental education 463 



INDEX. . , 493 



