466 Intelligence and Miscellaneotts Articles. 



that when a cyhnder magnet was spun in tlie air, one kind of elec- 

 tricity could be collected at its equatorial parts, and the opposite 

 kind at the polar parts. 



April 6 . — Mr. Thos. Bell on the recent Discoveries made by Ehren - 

 berg on the Structure and Physiology of the Infusoria. 



By feeding these microscopic animals with coloured food, as in- 

 dio-o, carmine, sap-green, &c., Ehrenberg has been able to ascertain 

 what parts received these matters, and to prove that their organization 

 is far higher than has usually been supposed. The substances used 

 must be perfectly pure, otiierwise the animals will not swallow it ; 

 but when pure it is instantly received, and many of them become 

 dotted with coloured spots in those places where the food is received. 



Animalcula have been arranged by Ehrenberg into two classes, 

 Polyirastrica, having many stomachs, and Rotatoria, including the 

 wheel-animals, wliicli have but one long stomach. 



'J'hese animals have been proved to have mouths ; — stomachs 

 sometimes amounting to 200 in number ; — intestinal canals ; — anal 

 apertures ; — ciliae round tlie mouths ; — luuscles; — a vascular system, 

 and a nervous system. They propagate by direct subdivision, or 

 by offsets, or by eggs ; — some are viviparous. 



LXIII. Intelligence and Miscellaneous Articles, 



MAGNETO-ELECTRICITY. 



WE have received apaperon new Magneto-Electric Experiments, 

 by Sig. Salvatore del Negro, of Padua, dated April 20, 1832, in 

 which it is stated that terrestrial magneto-electric action was first ob- 

 served by Sig. Nobili andAntinori. This is a serious historical error ; for 

 the subject will be found fully investigated in Mr. Faraday's paper, read 

 to the Royal Society on the 12th January, 1832, and lately published 

 in the Philosophical Transactions. We shall insert a translation of Sig. 

 Negro's paper, with historical notes by Mr. Faraday, in our next Num- 

 ber. 



ORDNANCE GEOLOGICAL SURVEY OF DEVONSHIRE. 



We understand that Mr. De La Beche has been appointed by the 

 Board of Ordnance to survey the Geological structure of Devonshire, 

 together with parts of the counties of Cornwall, Somerset, and Dor- 

 set; — a district comprised within eight sheets of the Ordnance Map 

 of Great Britain, which will be coloured geologically, in conformity 

 with the results of this survey. We hail this appointment, as a pre- 

 lude to further manifestations of a feeling of due appreciation, on the 

 part of the Government, of the ^aiue of scientific researches and the 

 knowledge derived from them, j 



CHE.MICAL ACTION OF LIGHT, !aND FORMATION OF HUMBOLDT- 

 INE W IT. 



If a solution of peroxalate of iron be kept in a dark place, or if it 

 be exposed to 21 2° of Fahr. for several hours, it does not undergo any 



sensible 



