xiv CONTENTS. 



II. Analyfis of a Memoir of Citizen Bonhomme on the Nature and Tuainunt 



of Rachitis or the Rickets. (Concluded from p. 177.) — — p. 200 



Singular experiments, in wliich oirificaiion was promoted by calcareous phofpliate. Application of 

 this refult, to the cafe of rachitis. Account of cures. Inferences and rcflcclions. 



III. Abftraft of a Memoir read at the Sitting of the French National Inftitute 

 on the a6th Pluviofe, containing an Accotint of fome Experiments concern- 

 ing the Sedion which Cylinders of Camphor undergo at the Surface of 

 Water ; with Reflections on the Motions which accompany this Seftion. 

 By J. B. Venturi, Proftlfor of Natural Phiiolbphy at Modena, Member of 

 the Inditute of Bologna, &c. — — — p. 205 



Motions of camphor upon wTiter. Se&ion at the furface of water. Explanation of this fact — and of 

 the rotation. Apparent caprice or uncertainty of the efTcfts accounted for. Several other motions 

 referabling the preceding. Additional fails and refieftions. 



IV. Analyfis of four Specimens of Steel ; with Reflections on the new Methods 

 employed in this Analyfis. By Citizen Vaiiquelin — — p. 210 



Account of the (led — and report concerning its qualities when made into tools. Excellence of the 

 hook-tool. Prefent ftate of the analyfis of ftecl — Its uncertainty and difEculties. New proccflls 

 with fteel, to feparate phofphorus, carbone, and manganefe. InfufScieney of Bergman's method 

 of feparating manganefe. 



V. Defcription of an Artificial Rock-Cryftal produced in the Humid Waj\ 

 By Mr. Trommfdorft", Profeflbr of Chemiftry at the Univerficy of Erfurt 



p. 217 



Previous remarks. Hillory of the fail. Rock-cryftal feparated from liquor of flints during five years 

 repofe. 



VI. Geological Obfervations on North-Wales. By Mr. Arthur Aikin — p. 220 



No proper volcanic produAions in North-Wales. Gradation of the ridges of lime, flate, ftratified 

 rocks, and granite in the greater chains of mountains. Figure of primitive, fecondar)', and deri- 

 vative mountains. Beds of rounded pebbles on the tops of the flate mountains. Theoretical 

 remarks. Metals. Coal. Primitive ftate and fubfequent changes in the face of the earth in 

 North-Wales. 



VII. An Account of the Fata Morgana i or the Optical Appearance of Figures 

 in the Sea and the Air in the Faro of Meflina. With an Engraving — p. 22^ 



Defcription of the phenomenon. Strange figures in the fea — and in the air — fometimts vividly 

 coloured with prifmatic fringes. Remarks and obfervations. 



VIII. A Memoir containing fome Refults arifing from the Aflion of Cold 

 on tiie Volatile Oils, and an Examination of the Concretions found in fcveral 

 of thole Oils. By Citizen Margueron, Member of the Societc des Pharma- 

 ciens at Paris, (Concluded from p. 186.) — — p. 227 



Katurc of the concretions in volatile oils. 



IX. Oa 



