METEOROLOGY. 415 



No. of paragraph. 

 Abbe, Prof. C. — Continuecl. 



Sudden pre8.siir(3 cbau<;e at Wasbiuj^rou 270 



Dinrual variat iou of barometer 276 



Hypsometric formula of Laplace 282 



Cbarts of storm frequency 283 



Causes of storm progress 287 



Origin of ligbtniug 295 



Location of thunder-storms 295 



Observations of heat lightning 296 



Disti ibution of thunder-storms 296 



Gusrs preceding thunder-storms 298 



On t he Koppen-Espy theory of sipialls and gusts 300 



Structure of tbuuder-storms 305 



Systems of weather changes 321 



Pri ncipal centers of action 323 



Long range predictions 328 



Auroral arches in United States 302 



Indian summer smoke haze 386 



Extraordinary twilight pbenomena of 185J3-'84 387 



Twilight due to aqueous spherules 390 



Eenewal in 1H84 of twilights of 1883 399 



Nebulous cloud about the sun 401 



Sun-spot period in temperatures 414 



Vegetation daring geological climate 425 



Thermal constants for locusts' eggs 429 



Abercromby, R. : 



Popular weather sayings 97 



European weather types 98 



Describes pocky clouds 207 



Abney, Captain, photograx)by of aqueous absorption bauds 373, 374 



Abney aud Festing, spectra at low and high temperatures • 374 



Actinometer : 



Hiru's absolute 173 



Stewart's improved 174 



Stokes' improved 174 



Langley's bolometer 179 



Frolich's thermopile 180 



Actinometry 173, 183 



Ackroyd, W., formation of rainbows 378 



Adamson, phtenological laws 421 



African coast, climate of 84 



Aerodynamics, experimental : 



Reynolds ...^ 213,264 



Darwin 214 



Vettiu 263 



Airy, Sir G. B. , temperature of the Thames 196 



Aitken, dust phenomena 208 



Agricultural experiments, Houghton farm .• 45 



Alcock, N., climate and complexion 432 



Algeria, climate of . .' 83 



Allahabad, meteorology of 10 



Amstein, H., barometer, self- registering 141 



Andries, Dr. P. : 



Origin of atmospheric electricity 310 



Formation of thunder-storms 310 



