At present, my ideas respecting solutions are shared by few, but I trust that by degrees the instances I give will pave the way for their general recognition, and it is my hope that they may find adherents among those of my readers who are in a position to work out by experiment this difficult but highly interesting problem.
In conclusion, I desire to record my thanks to V. D. Sapogenikoff, who has corrected the proofs of the whole of this edition and compiled the indexes which greatly facilitate the search for those details which are scattered throughout the work.
D. MENDELÉEFF.
Footnotes:
TABLE I
Distribution of the Elements in Groups and Series
| Group | I. | II. | III. | IV. | V. | VI. | VII. | VIII. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Series | 1 | H | — | — | — | — | — | — | |||||||||||
| „ | 2 | Li | Be | B | C | N | O | F | |||||||||||
| „ | 3 | Na | Mg | Al | Si | P | S | Cl | |||||||||||
| „ | 4 | K | Ca | Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | |||||||
| „ | 5 | (Cu) | Zn | Ga | Ge | As | Se | Br | |||||||||||
| „ | 6 | Rb | Cr | Y | Zr | Nb | Mo | — | Ru | Rh | Pd | Ag | |||||||
| „ | 7 | (Ag) | Cd | In | Sn | Sb | Te | I | |||||||||||
| „ | 8 | Cs | Ba | La | Ce | Di? | — | — | — | — | — | — | |||||||
| „ | 9 | — | — | — | — | — | — | — | |||||||||||
| „ | 10 | — | — | Yb | — | Ta | W | — | Os | Ir | Pt | Au | |||||||
| „ | 11 | (Au) | Hg | Tl | Pb | Bi | — | — | |||||||||||
| „ | 12 | — | — | — | Th | — | U | — | |||||||||||
| R 2 O | R 2 O 2 | R 2 O 3 | R 2 O 4 | R 2 O 5 | R 2 O 6 | R 2 O 7 | Higher oxides | ||||||||||||
| — | RO | — | RO 2 | — | RO 3 | — | RO 4 | ||||||||||||
| — | — | — | RH 4 | RH 3 | RH 2 | RH | Hydrogen compounds |
TABLE II
Periodic System and Atomic Weights of the Elements
(Giving the pages on which they are described)