INDEX. 35 



Ship, a mediod to prevent their foundering, 301 — propofed improvement 

 in their rigging and cables, 297 — objeftions to the modern conftrucSi- 

 on of, 302 — liow to provide againfl the accidents of overfetting, 

 fire, lightning, running foul of others and ice at night, ib. 



's -zvay, a new machine for meafuring it, Vol. II. p. 159 — Vol. III. p. 



239 — obfervations on. Vol. II. p. 294. 



Shippen (Jofeph) his account of the contads in the tranfit of Venus over 

 the fun, Vol. I. p. 45. 



Signals, an improvement on, Vol. IV. p. 162. 



Silk cocoons of Americu (native) larger and tlie filk ftrongcr than Italian, Vol. 

 I. pref. p. vi. 



— '- 'worm, its procefs from the egg to the cocoon. Vol. II. p. 347 — natural' 

 hiftory of, 350 — how to manage it, 351 — cocoons ot various kinds, 

 353 — the filature, 361. 



ivorms (native; Vol. I. prcf. p. vi. — obfervations on them p. 224 



— more beautiful on every change, 228 — averfe to change of food, 

 229 — ealier to raife than tire Italian worm, 230 — great weight of their 

 cocoons, ib. 



^ra/f, or Indian hemp of America — ^ if not the Chinefe herba ? Vol. I. 



pref. p. vi. 



Situs, how to find the fum of their powers, Vol. III. p. 15J. 



Siren, or inguana [firen lacertina] a new fpecies of. Vol. IV. p. 277. See 

 I ng liana. 



operculata, a new Ipecies of inguana dlfcovered, Vol. IV. p. 277 — de- 



fcribed, 279. 



. an intermediate clafs connedling the amphibias with fifti, Vol. IV. p. 277. 



Skeleton of an unknown quadruped lately difcovered in Virginia, Vol. IV. p, 

 236. See Bones. 



Slate,' and excellent freeftone on L. Erie, Vol. IV. p. 226. 



Smi/i f Revo-end Dr. fVm.J his communication of calculations and projeftions 

 oi the tranfit of Venus in 1769, Vol. I. p. 4 — his account of that tran- 

 fit, 8 — and of the contafts, 29 — of Mafon and Dixon's meafurement of 

 a degree of latitude, 96 — of the terreftrial meafurement of the differ- 

 ence of Ion. and lat. between Philadelphia and Norriton obfervatories, 

 appendix p. 5 — of the tranfit of Mercury in 1769, appendix p. 50 — his 

 deduftion of the fun's parallax from a comparifon of tlie American 

 obfervations of the tranfit of Venus in 1769, with European obfervati- 

 ons of the fame, p. 54. 



(Thomas P.J his account of a kettle for boiling inflammable fluids. 



Vol. IV. p. 431 — ^his account of cryftallized bafaltes found in Pennfyl- 

 vania, p. 445. 



Smoie of burnt bones, deftruflive to bugs, &c. Vol. I. p. 222. 



, why it afcends, though heavier than air. Vol. II. p. 2 — how to burn 



it. 33> 57 — burning it a great faving of fuel, 67 — ufeful for heating the 

 walls of a hot houl'e, 74. 



Srao^j' chimnies, caufes of, Vol. II. p. 5, 10, 12, 13, 14, IJ, 16, 17, 232 

 — how to remedy them, 6, 11, 12, 14, 15, 17, 18, 23, 232. 



Snake in a horfe's eye, Vol. II. p. 385. 



(rattle) on the cure of its bite. Vol. III. p. 100 — how to connteraifl its 



poifon, 102, 104, 109 — reputed cures for it, 114— on its fuppofed fafci- 

 nating faculty. Vol. IV. p. 74. See Serpents. 



4 E Snow 



