INDEX. 



page 



Sound, on sonorous cavities, - - - - 116 



on its divergence, - - - - 1 1 8 



— on its decay, - - - - 120 



— - — on the harmonic sounds of pipes, - - 1 2 1 



on the vibrations of different elastic fluids, - 124 



on the analogy between light and sound, - - 125 



on the coalescence of musical sounds, - - 130 



— — on the frequency of vibrations constituting a given note, 133 



on the vibrations of chords, - - - 134 



on the vibrations of rods and plates, - - 140 



on the human voice, - - - 141 



on the temperament of musical intervals, - 143 



Space, on penetrating into it by telescopes, - - 49, 64 



Sponge, experiments on various species of, - - 352, 364 



Sun, on viewing it advantageously, - - 255, 273 



on the refrangibility of its invisible rays, - - 284 



■ See Heat and Rays. 



Survey, trigonometrical, carried on in the years 1797, 1798, and 



1799, account of, 539 

 particulars relating to the operations of the 



year 1797, - - - - 542 



angles taken in the year 1797, - 5491 



! particulars relating to the operations of the 



year 1798, - - - - 555 



angles taken in the year 1798, - 559 



particulars relating to the operations of the 



year 1799, - - - - 563 



— — — -— -— angles taken in the year i799> - 569 



/ situations of the stations, - 576 



particulars relating to the base on Sedgemoor, 584 



- principal triangles, - 588, 677, 702 



secondary triangles, - 610, 689, 703 



- latitudes and longitudes of various places, 624, 



644, 649, 655, 661 

 — — — — — bearings of the stations from various paral- 

 lels, - ... ^ 643, 653 

 — bearings of intersected objects from various 



parallels, - - - - 645, 657 



— survey of the northern and western parts 



of Kent, Essex, Sec. - - - 676 



altitudes of the stations, - 710,717 



mean terrestrial refractions, - 715, 719 



Sumivorsbip. See Reversions. 



