19^ Mr» Brayley on the Rationale of the Formation [Sept. 



were also tried, and found to be both represented on the same 

 scale by the same fraction, viz. 0*85, being but very little inferior 

 to tin. 



When the soldering is imperfect, the effect in restoring the 

 magnetic action is proportionally weaker, but the influence of 

 ever so small a free metallic communication is sensible. 



A disc of lead cut in 8 radii as above was found to make one 

 revolution in 58^*3. It was then wetted so as to fill the cuts 

 with sulphuric acid, and the time of revolution was found to be 

 57*3 ; so that the influence of sulphuric acid, even when thus 

 magnified, is still equivocal ; and its magnetism, if it exists, can 

 hardly be estimated at a thousandth part of that of copper, and 

 is probably still lower. 



The reduction of the metals to filings or to powder, was found 

 to produce a still more striking diminution of their magnetic 

 energy ; and a class of experiments of great interest, as to the 

 effect of the agglutination of these powders by metallic and non- 

 metallic cements and liquids, immediately presents itself; into 

 which want of leisure only has hitherto prevented our entering, 

 as well as on the important subject of the magnetism of metallic 

 alloys and atomic combinations, with which this branch of the 

 inquiry is essentially connected. 



(.Tole continued.) 



Article III. 



On the Rationale of the Formation of the Filamentous and 

 Mamillary Varieties of Carbon ; and on the probable Existence 

 of but two distinct States of Aggregation in Pwiderable Matter. 

 By E. W. Brayley, Jun. ALS. 



(To Richard PhiUips, Esq. FRS. &c.) 



DEAR SIR, July 7, 1826. 



I HAVE perused with much attention and interest Dr. Colqu- 

 houn*s paper on the new capillary variety of carbon, &c. in the 

 Annals for the present month ; and I beg to offer a few remarks 

 on some of the phaenomena and substances in question, which 

 you may, perhaps, deem worthy of insertion as supplementary 

 to his communication. Dr. Colquhoun regards the mode of 

 formation of the filamentous carbon he so minutely describes, as 

 inexphcable by any facts which chemistry can as yet furnish ; 

 and he considers the evidence afforded by the external charac- 

 ters of that and some of the mammillated varieties, of their 

 forms having been assumed out of a state of fusion, to be, when 

 viewed in conjunction with the known infusibility of carbon, 

 anomalous in the extreme. I may possibly have overlooked or 



