First, the law deals with action and reaction alone. This in itself rules out the material except so far as the material is a conductor, vessel or instrument through which the force acts. it implies Newtons third law, that to every action there is an equal and opposite reaction.
Therein lies the danger of the so-called physical methods in therapy. How can we measure the force of the reaction in advance? How can we know how much stimulation to apply in the first place? If we are still at sea regarding potency how can we estimate the effects of cruder methods?.
It seems to me that in the dynamic state with a certain amount of potential the reaction is greater than the original stimulus. The matter of potential and its factors are of more concern than even the law itself, for they are the conditions under which the law acts. If it be true that energy cannot be destroyed we may cause to worry about the energy itself and look to those factors which modify its action.
What we know as impaired or reduced vitality is not a diminution of the strength of the force but a leaking away of it. Life may be compared to a fully charged storage battery (a simile better than that of an engine, I think). This fully charged storage battery has a certain potential. If all the wiring from this battery is well connected and insulated the proper function of the battery results, but if there is a short circuit, function is impaired although the potential and actual strength of the battery is normal. Under proper conditions the strength and potential of the battery may be restored-D. PULFORD.