Although "Wiggles" have formed a feature of Young People from the beginning, and have excited a very general interest amongst our youthful artists, many of our correspondents write that they do not understand them. For the benefit of these we will explain that Wiggles, sometimes called "recondite forms," are lines forming portions of the outlines of pictures. New Wiggle No. 21 is one of these lines, and it forms part of the outline of a picture already drawn by "our artist." The object of those who attempt to solve the Wiggle problem should be to draw a picture containing this line. In looking over the Wiggles on this page you will see that Bessie R. Hull had very nearly the same idea of a picture that our artist had when he drew Wiggle No. 20. We have room to publish only a few of the hundreds of ideas of each Wiggle that are sent to us, and there is no regular time fixed for their publication; but those that are drawn with the greatest care, and sent in the earliest, stand the best chance of being published. Will Bessie R. Hull please send us her full address?