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VI. On Chemical Dynamics and Statics under the Influence of Light. 
By Meyer Wilderman, Ph.D., B.Sc. ( Oxon .). 
Communicated by Dr. Ludwig Mond, F.R.S. 
Received January 30,—Read February 13,—Received in revised form, June 24, 1902. 
Contents. Page 
Introduction.337 
Part I. 
General Arrangements for preparation of Pure Chlorine and Carbon Monoxide and for 
filling Reaction Vessel.341 
Preparation of Pure Chlorine. ... 347 
Preparation of Pure Carbon Monoxide.349 
Part II. 
Arrangements for an Acetylene Light of 250 candle-power of constant Intensity and 
Composition..351 
Arrangements for Measurement and Adjustment of Intensity of Acetylene Light .... 356 
Remaining parts of the Apparatus.363 
_ . ' . _ . Part III. 
Experimental Results :— 
The Law of Chemical Dynamics under the Influence of Light.388 
The Induction and Deduction Periods of Energy and the Chemical Induction and 
• Deduction Periods in Light.389 
The Influence of Small Traces of Air and Water.391 
The Law of Chemical Statics under the Influence of Light.393 
Appendix:—Relation of Results obtained to Thermodynamics.395 
Introduction. 
The nature of the forces which come into play when substances react one upon 
another chemically, is a problem which has specially engaged scientific minds during 
the last century. During the second half of that period chemical statics and 
dynamics have developed into a veritable science. The general law governing the 
velocity of chemical reaction and chemical equilibrium in homogeneous systems is 
now known as the law of mass action, and was to a great extent foreseen by 
Berthollet. # In heterogeneous systems the law concerning the velocity of physical 
* C. L. Berthollet, ‘Essai de Statique Chimique,’ 1803; Wilhelmy, 1850; Harcourt and Esson, 
1866; Guldberg and Waage, 1867 ; van’t Hoff, 1878. 
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