velocity, but in ordinary circumstances the guinea would obviously fall more quickly than the feather, because the resistance of the air bears a much larger ratio to the weight of the feather than that of the guinea. As the resistance of air to a moving body acts more forcibly on a light than a heavy substance, so likewise does air when in motion and acting as a moving force. When particles of sand or gravel are driven by the wind, the lightest particles go the greatest distance. So it is with the two kinds of fur in the "blowing machine," those fibers which are finest and lightest are driven to the remote end of the machine. [Illustration: BLOWING ENGINE.] The "body," or "foundation," of a good beaver hat is generally made of eight parts rabbit's fur, three parts Saxony wool, and one part of llama, vicunia, or "red" wool. A sufficient quantity of these for one hat (about two and a half ounces) is weighed out and placed in the hands of the "bower." On entering the "bowing-room" a peculiar twanging noise indicates to the visitor that a stretched cord is in rapid vibration, and the management of this cord by the workman is seen to be one of the many operations in hatting wherein success depends exclusively on skillful manipulation. A bench extends along the front of the room beneath a range of windows, and each "bower" has a little compartment appropriated to himself. The bow is an ashen staff from five to seven feet in length, having a strong cord of catgut stretched over bridges at the two ends. The bow is suspended in the middle by a string from the ceiling, whereby it hangs nearly on a level with the work-bench, and the workman thus proceeds: The wool and coarse fur, first separately and afterwards together, are laid on the bench, and the bower, grasping the staff of the bow with his left hand and plucking the cord with his right hand by means of a small piece of wood, causes the cord to vibrate rapidly against the fur and wool. By repeating this process for a certain time, all the original clots or assemblages of filaments are perfectly opened and dilated, and the fibers, flying upwards when struck, are, by the dexterity of the workman, made to fall in nearly equal thickness on the bench, presenting a very light and soft layer of material. Simple as this operation appears to a stranger, years of practice are required for the attainment of proficiency in it. [Illustration: BOWING]