fac-simile of the letter or circular, and at each passage of the ink roller over the porous and waxen sheets another circular is printed.
The new rotary mimeograph will print a circular at every turn of a handle, and we have seen some marvelous work done with it in an astonishingly short time. At an exhibition some time since of the capabilities of producing circulars by the combined use of the typewriter and the mimeograph, 100 words were written on a typewriter and the first mimeograph copy produced in two minutes and fifteen seconds. One hundred copies of the circular were then run off in two and one-half minutes more, making four minutes and forty-five seconds from the time the circular was started on the typewriter to the time when 100 copies were printed ready for folding and placing in envelopes. This shows the rapidity with which circulars may be reproduced. Pupils at school should learn how to make stencils for the mimeograph and how to use the machine. Nearly every business firm has use for this invaluable aid to circularizing.
THE HEKTOGRAPH.
The hektograph and similar inventions are made of a composition placed in shallow tins. The composition, which has somewhat the appearance of glue, is first wiped with a damp cloth and the typewritten letter, written with a specially prepared hek-
