Warren De la Rue FRS FRAS (18 January 1815 – 19 April 1889) was a British astronomer, chemist, and inventor, most famous for his pioneering work in astronomical photography.[1][2][3][4] (wikipedia)
By shading off, as I have done, the portion of the area of the diagram according to the individual age, every one may see how much of life is consumed, and what is left.
Nature's laws must be obeyed, and the period of decline begins, and goes on with accelerated rapidity.
For a deeper interest in the Moon than I ever felt before.
