398 



Intelligence and Miscellaneous Articles. 



A number of liquids and solutions of bodies which could not be 

 obtained solid in a suitable condition, were placed in a glass vessel 

 with sides formed of plane parallel rock-salt plates 2 millims. in 

 thickness. The layer of liquid was 8 millims. in thickness. 



The following numbers give the heat transmitted, in percentages of 

 that which passed through the empty vessel ; they thus still less give 

 absolute values of absorption than did those in the first Table. 





Transmitted heat. 



Lampblack 

 at 100°. 



Gas-flame. 



Chloride of tin (SnCl 4 ) 



per cent. 

 44 

 41 

 50 

 52 

 44 



5 



2 











per cent. 

 80 

 95 

 51 

 57 

 47 

 38 

 30 

 12 

 12 



Chloride of sulphur (SCI 2 ) 



Bisulphide of carhon (CS 2 ) 





Iodide of tin in hisulphide of carhon 



Terchloride of carbon (C 2 CI 6 ) in CS 2 ... 

 Chloroform, CHC1 3 



Dutch liquid, C 2 H 4 CI 2 



Iodide of ethyle, C 2 H 5 I 





The solution of phosphorus contained only 1 part of bisulphide 

 to 10 of phosphorus ; the solution of iodide of tin 1*5 part of iodide, 

 SnI 4 , to 1 part CS 2 ; the solution of chloride of carbon 1 part C' 2 CI 6 

 and 4 parts CS 2 . From the diathermancy of the solutions the dia- 

 thermancy of the substances dissolved may be concluded. 



Hence it is probable that the haloid compounds of all elements in a 

 solid or liquid state are partially diathermanous for lampblack-heat at 

 100° C. ; likewise many sulphides. The haloid compounds of com- 

 plex radicals — of ammonium, ethyle, &c, do not seem to share the 

 properties of the compounds of the elements. 



It has been previously assumed that all substances absorb the heat 

 of obscure sources more powerfully than those of luminous ones, 

 excepting lampblack*, in very thin layers, which conversely absorbs 

 the heat of luminous sources more powerfully than those of obscure 

 ones. In like manner, some of the substances in the first Table 

 (selenium, zincblende, chloride of silver) exhibit the same deport- 

 ment. — Berliner Berichte, September and October 1869. 



ON THE INFLUENCE OF SOUNDING- VIBRATIONS ON THE MAGNE- 

 TISM OF IRON. BY DR. E. WARBURG. 



Matteuccif. and after him VillariJ, have examined the change 

 which the magnetic momentum of an iron bar undergoes when it is 

 lengthened by a pull. Villari's numerous experiments prove that 

 the magnetism of an iron wire which is placed in a magnetizing 

 spiral, and has attained a stable condition which is no longer altered 



* Melloni, Ann. der Chem. vol. lxxii. p. 40. 

 t Ann. de Chim. et de Phys. vol. lviii. p. 416. 

 X Pogg. Ann. vol. cxxvi. 



