588 



INDEX. 



Thunder-storms, etc., distribution 

 of, through the day, 55. 

 general account of storms 



through the summer, 17-38. 

 reduction of observations, 16. 

 review, 54-58. 

 storm of July 9th, 38-4:5. 

 barometric changes, 44. 

 change of temperature, 43. 

 chart, 39. 



clouds before the rain, 39. 

 description of a composite 



portrait, 44. 

 relation of wind and rain, 

 42. 

 storms of July 21st, 45-54. 



changes of temperature, 52. 



chart, 46. 



chart of afternoon storm, 



54. 

 composite portrait of sur- 

 face effects, 51. 

 Tilia, 305. 



Americana, L., 305. 

 heterophylla. Vent., 305. 

 Mexicana, Schlecht., 305. 

 pubescens. Ait., 305. 

 var. leptophylla, Vent., 305. 

 Tiliacese, 305. 



Tithonia tubaeformis, Cass. , 426. 

 Trachelosperniura stans, Gray, 435. 

 Trachypogon polymorphus, Haeckel, 

 460. 

 subvar. secundus, Ilaeckel, 460. 

 Tragia nepetaefolia, Cav., 451. 



var. setosa, 451. 

 Tragoceras zinnioides, HBK., 423. 

 Trema micrantha, Blume, 452. 

 Tribulus, Tourn., 306. 

 Trichlorbenzol, symmetrical, on the 

 action of nitric acid on, 372. 

 preparation of, 375. 

 Trichlordinitrobenzol, 377. 



properties, 377. 

 Trichlortrinitrobenzol, 378. 



properties, 378. 

 Tridax balbisioides, Gray, 430. 



procumbens, Linn., 430. 

 Trifolium goniocarpum, Lojacono, 



403. 

 Tripar abro mbenzoate , pyrogallol, 

 257. 

 properties, 258. 

 Tripsacum fasciculatum, Fourn., 



460. 

 Trisetum deyeuxioides, Kunth, 461. 



Tristachya leiostachya, Nees, 461. 

 Triumfetta brevipes, 400. 



insignis, 400. 



Palmeri, 400. 



semitriloba, Linn., 400. 

 Turnera Palmeri, 413. 



ulmifolia, Linn., 413. 



var. Surinamensis, Urban, 413. 



U. 



Uncinia breviseta, Torr., 122. 



Europ«a, Gay, 61. 



microglochin, Sprengel, 61. 

 Urera Caraeasana, Griseb., 453. 

 Utricularia deuticulata, Benj., 442. 



V. 



Valeriana apiifolia. Gray, 417. 



Palmeri, Gray, 417. 

 Variable stars, observations of, in 

 1886, 380. 



explanation of abbreviations, 

 381. 



explanation of tables, 382. 



remarks, 390, 391, 395. 



tables, 384-394. 

 Verbena ciliata, Benth., 444. 

 Verbesina crocata, Less., 428. 



disseta, 309. 



l>innatifida, Cav., 428. 



sphgerocephala, Gray, 428. 



stricta. Gray, 427. 



tetraptera, Gray, 428. 



virgata, Cav., 428. 

 Vernonia foliosa, Schultz Bip., 417. 



serratuloides, HBK., 417. 

 Verrill, Addison Emery, election of, 



507. 

 Viguiera excelsa, Benth., 426. 



helianthoides, HBK., 426. 



Palmeri, Gray, 427. 



quinqueradiata. Gray, 426. 



tenuis. Gray, 426. 

 Vincetoxicum astephanoides, Gray, 



435. 

 Viola Howellii, 308. 

 Vitex mollis, HBK., 444. 

 Vitis Cariba?a, DC, 403. 

 Voltaic arc, the inverse electromotive 



force of the, 227. 



