1818.] Scientific Intelligence. 315 



3. Rice contains 



Fecula 96-0 



Sugar 1 .0 



Fat oil 1-5 



Albumen 0-2 



98-7 



4. Carbonic acid gas will not supply the place of yeast and 

 leaven in fermentation. Hydrogen will make the dough rise, 

 but will not make it ferment. 



5. The constituent parts of farina, when they have been once 

 separated, cannot be reunited, so that the farina should become 

 proper for making bread. 



6. Wheaten bread is composed of 



Sugar 3"6 . 



Torrefied fecula 18*0 



Fecula 53-5 



Gluten combined with a little fecula 20-75 



Carbonic acid — 



Muriate of lime — 



Magnesia — 



XIII. State of Hie Magnetic Needle at Paris. 



Feb. 10, 1817, at one p. m. the variation of the magnetic 

 needle was 22° 17' W. This observation, compared to those 

 of the two preceding years,* seems to leave no doubt of the 

 retrograde motion of the magnet. March 14, 1817, two p. m. 

 the inclination of the needle was 68° 38'. The same instalment 

 in Oct. 1810, was 68° 50'. (Ann. Chim. Dec. 1817.) 



XIV. Mr. Howard's Work on Meteorology . 



Mr. Luke Howard will shortly publish, in two volumes, a work 

 entitled, " The Climate of London, deduced from Meteorological 

 Observations made at different Places in the Neighbourhood of 

 the Metropolis." Vol. I. will contain an introduction relative to 

 the construction and uses of several meteorological instruments ; 

 tables of observations for ten years, with notes and results ; 

 accoimts of collateral phenomena in other parts of the world, and 

 occasional dissertations. Vol. II. will contain a methodical 

 account of the climate of London, under the several heads of the 

 winds, barometer, temperature, rain, evaporation, electricity, 8cc. 

 deduced from the facts contained in the first volume ; with 

 copious general tables, and an index to the whole work. To 

 which will be added, " An Essay on the Modifications of 

 Clouds," by the same Author, several times heretofore printed. 



» The variation of the needle at Parii, Oct. 12, 1S16, was 22° 25' W. (Ann. 

 Chim. Dec. 1816.) 



