"The logic of modern Physics" by Percy Williams Bridgman,1927

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The concepts of physics should be flexible in order not to restrict the possibilities of future experience.
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To provide flexibility,concepts should be defined operationally ;
the concept is synonymous with the operations by which one determines whether the concept applies,or what the measure of something is.
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There is no absolute time ;
time is measured by reference to clocks of some sort.
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Such concepts as causality,identify,force,energy,temperature,
and light become useful and meaningful as they are defined by reference to physical phenomena and operations of measurement.
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"Ethics" by Nikolai Hartmann,1926

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Ideal principles influence real things ;
values and obligations have autonomous being in the realm of essence,
but provide human beings with the foundations of morality.
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Valuational insights are possible to men of moral genius who discern new value complexes.
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There is a determinate order among values ;
although values are relative to persons,
they have objective status.
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Moral values are realized by seeking to secure such nonmoral values as intelligence,health and equality.
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The three principal branches of the good are :
the noble,
richness of experience,and
purity.
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Moral law can bind the will without determining it because the will operates under the influence of moral obligation,on a plane between the physical and the ideal.
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