Theory... demands a practical test. All its data are derived from observation; and their insecurity becomes less tolerable as it advances nearer to perfection.


A Popular History of Astronomy During the Nineteenth Century (3rd, edition), Introduction (p. 3)

Agnes Mary Clerke Quotes

Theory... demands a practical test. All its data are derived from observation; and their insecurity becomes less tolerable as it advances nearer to...

Theory... demands a practical test. All its data are derived from observation; and their insecurity becomes less tolerable as it advances nearer to...

Theory... demands a practical test. All its data are derived from observation; and their insecurity becomes less tolerable as it advances nearer to...

Theory... demands a practical test. All its data are derived from observation; and their insecurity becomes less tolerable as it advances nearer to...