h CONTENTS, 



APRIL 1803. 



Engravings of the following Objects : 1 . A new Reflecting Quadrant, by Mr f 

 Ezekiel Walker j 2. Mr. Huddleftone's Method of floating Boats from one 

 Level to another without Lofs of Water j 3. Engine for blowing up the Stumps 

 of Trees, by Cit. Saint Viaor; 4. A Magazine Piftol with one Barrel, which 

 fires Nine Balls in Succeffion by once Loading. 



)L An Analyfis of a Variety of the Corundum. By the Reverend Wm. Gregor. 

 Communicated by the Author. - - - - - - 209 



II. Letter from Mr. William Henry. Concerning the Invention of Aromatic 

 Vinegar. - - - - - -*• '• 215 



•III. Caution againft the Danger of leaving Phofphoric Preparations in the Vi- 

 cinity of Wood. By a Correfpondent. - - - 217 



IV. Description of a new Reflecting Quadrant. By Mr. Ezekiel Walker. 

 From the Author. - -"- . . . 218 



V. Mifcellaneous Information. Miftake refpe&ing Dr. Thompfon, Author of 

 the Elements of Chemiftry. Obfervations on the Scottish Querns. On the 

 fuppofed Determination of the real Zero of Heat. In a Letter from a Cor- 

 refpondent. - - - - , - - 220 



VI. Outline of the Craniognomic Syftem of Dr. Gall of* Vienna. By Dr. Bo- 

 james. --------224 



VII. Method of conveying Boats or Barges from a higher to a lower Level, 

 and the contrary, on Canals, by means of a Plunger, inftead of lofmg Water 

 by Locks. By Lawfon Huddlefton, Efq. of Shaftfbury, DoiTet. Communi- 

 cated by the Inventor. ------ 236 



VIII. An eafy Method of Churning Butter. By Cit. Jumilhac, Prefident of 

 the Society of Agriculture, of the Seine and the Oife. - - 241 



IX. Defcription of a Machine for rooting up the Stumps of Trees. By Cit. 

 Saint Viclor, Member of the Society of Agriculture, for the Department of 

 the Seine. ------- 243 



X. Method of Secret Writing, by means of a Steganographic Scale. By J. B. 

 Berard. - - - - - - 246 



XI. Defcription of a Magazine Piftol, which when loaded is capable of being 

 difcharged Nine fucceflive Times through the fame Barrel. - 250 



XII. On the DifTemination of Plants. By Cit. L. Reynier. <- 253 



XIII. An Effay on the Declivities of Mountains. By Richard Kirwan, Efq. 

 L. L.D.F. R. S. and P. R. LA. 256 



XIV. A Memoir on Animal Cotton, -or the Infec"t Fly-Carrier. By M. Baudry 

 des Lozieres, Member of feveral Academies, and Founder of the Society of 

 Sciences and Arts, at Cape Francois. - 266 



XV. An EiTay on the Fecula of Green Plants. By Profeflbr Prouft. 273 



Scientific News, Account of Books, &c. — Prize Queftionyof Foreign Learned 

 Societies — Flafli from an Air-gun — Letter from Profeflbr Prouft to J. C. De- 

 lametherie, on Sugar of Grapes — On the Uie of Sulphate of Soda in the Ma- 

 nufactory of Glais — Obfervations on the Neceffity of immerfing Seeds in Water 

 in Times of Drought— Extract from a Memcir by Cit. Fourcroy — An EfTay 

 on the Relation between the Specific Gravities and the Strength and Values of 

 Spirituous Liquors. - 278 to 285 



