Page:Life in Motion.djvu/147

Rh the other has been tetanised at intervals by an arrangement I need not at present describe. You observe that the mercury has risen in each case. I add a little lime-water to the tube containing the muscle that has been working hard, and you see how muddy it

at once becomes. The same experiment with the resting muscle does not show the same degree of muddiness, indicating that the resting muscle has not produced so much carbonic acid as the working muscle. Still it is interesting to observe that even