Oct., 1875.] ELLIOTT SOCIETY. 81 



creasing from left to right, and are also arranged in vertical columns, as seen 

 in the Table, guided by the order of succession of those niunbers. The Ele- 

 ments belonging to each horizontal line, I shall call a Group, and indicate it by 

 the number or index, with its sign, in the first column ; those in each vertical 

 column, I shall call a Series, and indicate it by the capital letter written at the 

 top of each column. 



Now reading each Series downward, beginning with A, and following the or- 

 der of the letters, a remarkable regularity will be observed in the succession 

 of the numbers, as far as the arrangement has been now described, yet with 

 gaps unfilled by numbers in several of the groups. Influenced and guided by 

 this order of succession, I now make the following deviations from the arrange- 

 ment of Barker's tables. I transfer the negative pentad V to group — 3, 

 placing it in series D, between P and As, which step is pei-mitted, since the 

 perissad character is still maintained and indicated, and may be supported by 

 urging the likeness in constitution and crystalline form between Pyromorphite 

 and Vanadinite, between Thrombolite and Volborthite, &c. In the same 

 group I place the pentad associates of V namely Cb and Ta, giving them the 

 places seen in the Table. I also place the negative hexad Cr in group — 2, on 

 the ground of the analogy between the Sulphates and Chromates, and with it 

 its negative hexad associates Mo and W. I place also in series K, the triad Bi in 

 group or line -|-3, the triad Au in group — 3, and the hexad Os in group — 2, 

 induced chiefly by the values of their atomic weights but in the case of Os also 

 by its combustibility when in fine powder, and by the pungent pecuUar odour 

 of the resulting oxygen compound, in which respects it resembles S, Se, and 

 Te. The only perissad now remaining, except H, is B, a triad contained in the 

 negative third of table II, but no suitable place can be found for !its atomic 

 weight in group — 3, and I place it in group or rather line +3, Series A, where 

 it finds a suitable place in the succession of numbers, and I mark it, as an es- 

 tray, with the negative sign. 



If it be objected that, in all these cases of the last section, chemical relations, 

 to exhibitwhich is the object of the Table, have been set aside, and the numer- 

 ical relations allowed to have too great sway, then two lines must be added to 

 the Table, above line — 4, with the indices — 5 and — 6. The triad B must 

 be placed in line — 5 in series B, where its negative and perissad character are 

 both indicated, and its atomic weight accords with the series of numbei-s below 

 it. The pentads V and its two associates must be carried to line — 5 their ap- 

 propriate location, and the hexads, Or, Mo, W and Os to their own in line — 6; 

 but then the orderly succession of numbers can no longer be preserved in the 

 series to which they belong. 



If however we take the Table as it is presented above, the continuity or regu- 

 larity in the series of numbei-s is very striking, the perissad or artiad character 

 of each element is preserved throughout, also, with a few exceptions, the promi- 

 nent degree of atomic equivalence, as monad, dyad, &c., is well preserved and in- 

 dicated ; the electro-chemical character, in addition, is very fahly presented, 

 indeed to such a degree, that no member of the electro-positive third of Bark- 

 VOL. n. 11 Published March, 18S6. 



