To those of my readers interested in the science of this spore-shower I give sectional illustrations of examples of the two more common groups of mushrooms--the Agaric, or gilled mushroom, and the Polyporus, or tube-bearing mushroom. The entire surface of both gills and pores is lined with the spore-bearing membrane, or hymenium, the spores falling directly beneath their point of departure as indicated; in the case of the Agaric, in radiating lines in correspondence with the spaces between the gills, and in Polyporus in a tiny pile directly beneath the opening of each pore. Some Curious Cocoons The title of this article will doubtless recall to readers of "Harper's Young People"[1] a paper upon a similar subject which appeared in my calendar series two years ago. With the title the resemblance ends, for the cocoons which I am about to describe are of a sort that has never been mentioned in any previous article. These curious cocoons had been familiar to me since my boyhood, having long excited my wonder before finally revealing their mystery. They have recently been brought freshly to my notice by a letter that I have received, accompanied by a box of specimens, which reads as follows: DEAR MR. GIBSON,--I have sent you to-day what I take to be three cocoons. These with three others I picked up from a gravel-walk in Po'keepsie over a year ago. They seemed connected at the ends, but easily broke apart. I kept them, purposing to see what would emerge, but nothing has rewarded my watch, and they seem now to be shrivelling up. Can you give me any information in regard to them? If so, I shall be very grateful to you. [1] Now "Harper's Round Table." I had barely read half through the brief description when I guessed the nature of the cocoons in question, having received similar letters before, as well as verbal queries, from others who had been puzzled by the non-committal specimens. The fact that they were found "on the gravel-walk," and were loosely "connected at the ends," was in itself strong evidence of their questionable nature, and I felt sure that I should recognize the cocoons as old friends. And I did. Upon opening the box, I found three of them packed in a mass of cotton, two of them still loosely attached at the ends, the third one somewhat disintegrated. Each was about an inch in length, and half an inch in thickness, somewhat egg or cocoon shaped. Upon being separated, one end of each was seen to be hollowed out, and had thus previously received the pointed end of its fellow in the "connected" condition in which they had been found. In color they were a mouse gray precisely, and to the careless observer might have appeared to consist of caterpillar silk, though in reality having a substance more like felt. Yes, they might easily be mistaken for cocoons if we simply contented ourselves with looking at them.