which reach beyond the human body. I remember well a day of serious
mental depression which I once suffered. But out of my sadness came
peace. Points in our memory lose their coloring rapidly, of course, yet
the feelings of that day and night still cause a thrill of pleasure in
my mind. I had been for days convinced that there were no real joys in
life. As my peace came, I began laboriously to pick out some chords on
a piano from the opera of "Lucretia Borgia"--the finale of the second
act. My labor was rewarded by the most pleasing sounds I had ever made
with my own fingers, and there was a general ebullition of pleasure and
expectation of future harmonies through my whole body for many hours
afterward. That night I went to hear a great scientist lecture on
astronomy.