INDEX. 
191 
® a uyi' 35 
Scale, Musical 186 
Self-recording instruments 47 
Seismograph 07, 70 
Sensations of tone as the physiolog- 
ical basis of music,” by Helm- 
holtz 174 
Siamese scale 179 
Societies for research in meteorology . 34 
Sodium 98 
— vapor 98 
Solar atmosphere 98 
— constant 92 
— spectrum 78 
‘‘Some problems connected with deep 
mining in the Lake Superior cop- 
per district,” by F. W. McNair.. 69 
Southwest monsoon, Causes of 43 
Spectroscope 78, 97, 100 
Spectrum analysis 78 
— invisible 89 
— of aurora borealis 41 
Stefan-Boltzmann law 84 
Strontium 96, 98 
Sun spots 98 
“Temperature and structure of the 
sun, On the,” by O. Lummer. ... 75 
Temperature, Distribution of 44 
— of dew-point 39 
Terrestrial magnetism 116 
— meteorology 51 
Page 
“The earth, a failing structure,” by 
J. F. Hayford 57 
“Theorla Motus,” Gauss’s 29 
“Theory of sound,” Rayleigh’s 29 
Thermodynamic complications 49 
— theory 54 
Thermodynamics 42, 50, 51, 85, 169 
Thorium 41 
Tides in the atmosphere 48 
Tonality 173 
Transparency of air 33 
Vacuum, Discovery of 34 
Viscosity 43 
— of air 34 
— or internal friction of fluids 49 
Vortex and wave motions in atmos- 
phere 49 
— motions 43 
Waterspout of August, 1896 51 
Wave motions in atmosphere 49 
“Weather Bureau Bulletin A, Sum- 
mary of International meteoro- 
logical observations” 46 
Report on International cloud 
observations 51 
United States 31,45,46,51,56 
Weather-map system 31 
Wet and dry bulb thermometer 39 
Whirled psychrometer 39 
