Eighth Commnn'tcation from iTr. Thornton. 4Zf. 

 "ftone; for example, Cornelias Severus, the author of a poeti- 

 cal defcription of that mountain, Theophraftus fpeaks alfo 

 of the pumice-ftone of aEtna, which he defcribes as black, 

 and hea«7 *. Under this head we may place the Catinenjis 

 /iM7«f.f of Juvenal t, though this phrafe will admit of an- 

 other explanation; and perhaps the poet meant only to in- 

 dulo-e in a little occafional raillery againft the celebrated vo- 

 luptuaries of Catina or Catana. I well know that we cannot 

 expect from poets, in general, the accuracy which mult be 

 obfervcd by naturalilts ; but thofe who confider the paiTage 

 as admitting of no doubt, may fupport it by the teltimony 

 •f Gioeni X, who found pumice-ftone, perfeAly like that of 

 I.ipari, in the neighbourhood of TEtna, during the eruption 

 of J 787; but he adds, that nothing of the kind had ever 

 keen found near ^Etna before. 



XX. E'lghih Communication fyovi Dr. ThoRNTOX, Vhyf.Aan 

 to the General Dlf. cvfary, relative to Pnmmatk Midiane. 



eASE OF PARALYSIS CURED I?Y THE INHALATIO?J OK 

 VITAL AIK. 



iVlR. HUITSON, who di (Teas for Mr. Cruickaiank and 

 Mr. Willou, eminent teachers in the fchool of the late Dr. 

 Hunter, luul a jjaralytic affetStion of the right hand, which 

 ^v-privcd hnn of its motion, and it felt to the other hand al- 



*- Set tfic faulty G^tnan tranflacion of his work on ftones, §40 p. i;c- 

 I flidll litre occafionally obltrvc, for tht iakc of thcf^ who are fuid (if com- 

 paring the accounts of the ancients and moderns, that a kind ul I raj's w-as 

 employed for niitl-ft>'ncs ip the time of Theophraftus and Sirabo. E.** 

 a:;e,v/.<.Ja7>'.viT«.>..6«,-jur.>..'(:. Strabo, Lib. VI. p. 4. 3. The ancients jvere 

 accjuauiicd alfo with the ufe of that kind called by Cronftedi the Rhenifli 

 niill-ftoncj a good dcfcription of which has been given by Collini mjom- 

 ■nalWim r&i'mv, MuTiheim 1776. 8- P- i^i. Compare alfo tns Ftnyikalif.k- 

 Qikon. Bibl'wib. Vol. Vll. p. 455 and 519, 



t Sai VllL lO. 



\ Sec i'w S.Ji': Cj,'!iJ?/wtj io:uar.i> a Nixltirai UJlor/ of ibc Kinjrhm of 

 tit T-.'.'u Su/.'/i-f, 17>J3. S. I. p. 171. 



ways 



