844.  After the first experimental investigations to establish the definite chemical action of electricity, I have not hesitated to apply the more strict results of chemical analysis to correct the numbers obtained as electrolytic results.  This, it is evident, may be done in a great number of cases, without using too much liberty towards the due severity of scientific research.  The series of numbers representing electro-chemical equivalents must, like those expressing the ordinary equivalents of chemically acting bodies, remain subject to the continual correction of experiment and sound reasoning.

845.  I give the following brief Table of ions and their electro-chemical equivalents, rather as a specimen of a first attempt than as anything that can supply the want which must very quickly be felt, of a full and complete tabular account of this class of bodies.  Looking forward to such a table as of extreme utility (if well-constructed) in developing the intimate relation of ordinary chemical affinity to electrical actions, and identifying the two, not to the imagination merely, but to the conviction of the senses and a sound judgement, I may be allowed to express a hope, that the endeavour will always be to make it a table of real, and not hypothetical, electro-chemical equivalents; for we shall else overrun the facts, and lose all sight and consciousness of the knowledge lying directly in our path.

846.  The equivalent numbers do not profess to be exact, and are taken almost entirely from the chemical results of other philosophers in whom I could repose more confidence, as to these points, than in myself.

847.  TABLE OF IONS.

Anions.

Oxygen 8
Chlorine 35.5
Iodine 126
Bromine 78.3
Fluorine 18.7
Cyanogen 26
Sulphuric acid 40
Selenic acid 64
Nitric acid 54
Chloric acid 75.5
Phosphoric acid 35.7
Carbonic acid 22
Boracic acid 24
Acetic acid 51
Tartaric acid 66
Citric acid 58
Oxalic acid 36
Sulphur (?) 16
Selenium (?)
Salpho-cyanogen

Cations.

Hydrogen 1
Potassium 39.2
Sodium 23.3
Lithium 10
Barium 68.7
Strontium 43.8
Calcium 20.5
Magnesium 12.7
Manganese 27.7
Zinc 32.5
Tin 57.9
Lead 103.5
Iron 28
Copper 31.6
Cadmium 55.8
Cerium 46
Cobalt 29.5
Nickel 29.5
Antimony 61.67
Bismuth 71
Mercury 200
Silver 108
Platina 98.6? 
Gold (?)

Ammonia 17
Potassa 47.2
Soda 31.3
Lithia 18
Baryta 76.7
Strontia 51.8
Lime 28.5
Magnesia 20.7
Alumina. (?)
Protoxides generally. 
Quinia 171.6
Cinchona 160
Morphia 290
Vegeto-alkalies generally.