How are we to combine these qualities? If the projectile has great penetrating force it will pass completely through an animal, and the striking energy will be diminished, as the force that should have been expended upon the body is expending itself in propelling the bullet after it has passed through the body. This must be wrong, as it is self-evident that the striking energy or knock-down blow must depend upon the resistance which the body offers to the projectile. If the bullet remains within it, the striking energy; complete and entire, without any waste whatever, remains within the body struck. If, therefore, a bullet '577 of 648 grains propelled by 6 drams of powder has at fifty yards a striking energy of 3500 foot pounds, that force is expended upon the object struck,--provided it is stopped by the opposing body. We should therefore endeavour to prevent the bullet from passing through an animal, if it is necessary to concentrate the full power of the projectile upon the resisting body. This is one reason adduced in favour of the hollow Express bullet, which smashes up into minute films of lead when it strikes the hard muscles of an animal, owing to its extreme velocity, and the weakness of its parts through the hollowness of its centre. I contend, on the contrary, that the bullet has committed suicide by destroying itself, although its fragments may have fatally torn and injured the vital organs of the wounded animal. The bullet has ceased to exist, as it is broken into fifty shreds; therefore it is dead, as it is no longer a compact body,--in fact, it has disappeared, although the actual striking energy of a very inferior bullet may have been expended upon the animal. If the animal is small and harmless, this should be the desired result. If, on the other hand, the animal should be large and dangerous, there cannot be a greater mistake than the hollow Express projectile.