IV CONTENTS. 



Part I — Chapter V — Class II — Continued. Page 



Aldehydes go-gi 



Terpenes 91-96 



Pyridine group 96-97 



Other cyclic compounds 98-99 



Chapter VI. — ^General discussion of the spectra 101-119 



Effect of structure 101-102 



Effect of molecular weight 102-106 



Effect of temperature 106-107 



The effect of certain characteristic groups of atoms 107-110 



Total absorption iio-iii 



Grouping of the spectra lii 



Characteristics of the spectra of carbohydrates 111-112 



Occurrence of harmonics 1 12-1 14 



Summary 115-118 



Appendix I. — ^Sources of radiation 119-121 



Appendix II. — The emission spectrum of the Hefner lamp 122-123 



Appendix III. — 'Electrification of radiometer vanes 124-125 



Appendix IV. — Absorption of solids in solution 126-128 



Appendix V. — ^Water of crystallization 129-131 



Appendix VI. — Indices of refraction of rock salt 132-134 



Appendix VII. — Correction of the work of Julius 135 



Tables : 



Table I. — Line spectra of gases 136 



Table II. — Line spectra of liquids and solids 136 



Table III. — Observed transmission of benzaldehyde 137-139 



Table IV. — Observed transmission, using a quartz prism at constant 



minimum deviation 140-141 



Table V. — Maxima of infra-red absorption band — gases 142 



Table VI. — ^Maxima of infra-red absorption bands — liquids and solids 143-146 



Table VII. — Observed transmission through gases 147-148 



Tables VIIIa to VIIIf. — Observed transmission through liquids and 



solids 149-165 



Transmission curves 166-285 



Part II. — Infra-red Emission Spectra. 



Chapter I. — Introduction 289-294 



Historical 289-294 



Infra-red spectrum 289-292 



Visible spectrum 292-293 



Temperature, dissociation, etc 293-294 



Chapter II. — Scope of present investigation 295-301 



The radiometer 295-298 



Table I. — Sensitiveness of different instruments 298 



Table II. — Sensitiveness of radiometer 299 



Other experimental details 300-301 



Object of the investigation 301 



Chapter III. — Infra-red emission spectra of metals 303-322 



Carbon arc 305-306 



Sodium 306-307 



Lithium 307 



Potassium 307-308 



