At eighty she published "Molecular and Microscopical Science." The worst of a lost hour is not so much in the wasted time as in the wasted power.

Idleness rusts the nerves and makes the muscles creak.
Work has system, laziness has none.
President Quincy never went to bed until he had laid his plans for the next day.
Dalton's industry was the passion of his life.

He made and recorded over two hundred thousand meteorological observations.
In factories for making cloth a single broken thread ruins a whole web; it is traced back to the girl who made the blunder and the loss is deducted from her wages.

But who shall pay for the broken threads in life's great web?
We cannot throw back and forth an empty shuttle; threads of some kind follow every movement as we weave the web of our fate.

It may be a shoddy thread of wasted hours or lost opportunities that will mar the fabric and mortify the workman forever; or it may be a golden thread which will add to its beauty and luster.