First Causes Are Outside The Realm Of

Progress Is Achieved By Exchanging Our Theories For New Ones Which Go Further Than The Old, Until We Find One Based On A Larger Number Of Facts. ... Theories Are Only Hypotheses, Verified By More Or Less Numerous Facts. Those Verified By The Most Facts Are The Best, But Even Then They Are Never Final, Never To Be Absolutely Believed.

Laplace Considers Astronomy A Science Of Observation, Because We Can Only Observe The Movements Of The Planets; We Cannot Reach Them, Indeed, To Alter Their Course And To Experiment With Them. "on Earth," Said Laplace, "we Make Phenomena Vary By Experiments; In The Sky, We Carefully Define All The Phenomena Presented To Us By Celestial Motion." Certain Physicians Call Medicine A Science Of Observations, Because They Wrongly Think That Experimentation Is Inapplicable To It.

Priestley [said] That Each Discovery We Make Shows Us Many Others That Should Be Made.

First Causes Are Outside The Realm Of Science.

The Constancy Of The Internal Environment Is The Condition For Free And Independent Life: The Mechanism That Makes It Possible Is That Which Assured The Maintenance, With The Internal Environment, Of All The Conditions Necessary For The Life Of The Elements.