CONTENTS, XV 



IX. On the Cold Winds which iflbe out of the Earth. By Profeflbr De 

 Sauflure and others ; with Obfervations — — p. 229 



Accounts of the cold caves of Mont Teftaceo, Ifchia, St. Mirlno, Cefi, Chiavenna, Caprino, and 

 Hergifweil ; together with thofe of Roquefort. Theory of the author ; from fuppofed refervoirs. 

 Objeaions. Another explanation from the imperfeft conduiSling powers of bodies. Similar fafls 

 in common buildings. 



X. The Combuftion of Phofphorus in the Vacuum of the Air-Pump. By 

 Dr. Martinus Van Marum" — — — P- 236 



•Combuftion of phofphorus in oxygene. Unexpeaed fpontaneous combuftion in vacuo. 



Mathematical Correfpondence — — — P- 237 



New Publications — — — " P- ^S^ 



SEPTEMBER 1797: 



I. Experiments and Obfervations made with the View of afcertaining the Nature 

 of the Gaz produced by pafling Eleftric Difcharges through Water ; with a 

 Dcfcripiion of the Apparatus for thefe Experiments. By George Pearfon, 

 M. D. F. R. S. — — — — P- 241 



Short account of the experiment of Pacts Van Trooftwyk and Dieman. DifEcuhy of repeating it. 

 Inftruaions for fuccefsfully conduaing this procefs. 



II. Analyfis of Four Specimens of Steel, with Refleclions on the new Method 

 employed in this Analyfis (continued from p. 217). By Citizen Vauquelin 



p. 248 



Experiments on the fpecimens. Table of the quantities of carbone, filex, phofphorus, and iron 

 in each fpecimen. Refleaions on the variable quantities of carburet obtained from Ifetl — on Berg- 

 man's method of difcovering phofphorus — and on the methods hitherto propofed to difcover and 

 feparate manganefe. 



III. Extraft of a Letter from Mr. Humboldt to Mr. Blumenbach, containing 

 ne* Experiments on the Irritation caufed by the Metals with refpeft to their 

 different ImprefTions on the Organs of Animals — — p. 256 



Strange cfTeas of galvanifm upon wounds occafioned by a bliftering plafter. Obfervations. Other 

 important fafts and experiments rcfpeaing irrilability. 



IV. Ufeftil Notices refpefting various Objcfts. — Methods of doling wide-mouth- 

 ed Veffels — Prcfcrvation of Gun-powder — Granulation of Shot — Precipiia- 

 lion of Magnefia — — — — P- 260 



Widc-mouthtd vcffcls clofcd by tinfoil, oil, &c. Ncceflity of keeping gun-powder very dry. De- 



b z kription 



