This is chiefly useful in cases of pleurisy. As already noticed the
vibration of the chest walls which accompanies the early friction sound
is sometimes perceptible by the hand applied on the side of the chest.
Pressing firmly in the intercostal spaces at the affected part
invariably causes wincing and in cattle grunting. Pinching the back in
inflammatory chest diseases in cattle but especially in pleurisy has a
similar effect.