In the mineral kingdom pectolite ought to take high rank, near the very throne. In its power of annoying man it is a formidable competitor to several illustrious members of the vegetable kingdom, such as the nettle, the cactus, the poison ivy and the domestic briar. There are, indeed, several members of the animal kingdom which hardly excel it in the power of producing human misery. Considering its remarkable aptitude in that bad way its rarity is somewhat difficult to understand, and is perhaps more apparent than real. Professor Hanks says that previously to its discovery in California it had been found in only eight places. If upon investigation these should turn out to be Europe, Asia, Africa, North and South America, Australia and the two Polar continents, the unnatural discrepancy between its objectionable character and its narrow distribution would be explained away, and pectolite seen to be “in touch” with its sister malevolences, whose abundance is usually in the direct ratio of their noxiousness to man. In his efforts to make this uncommon mineral known, advance its interests and bring it into closer relations with mankind, Professor Hanks is winning golden opinions from the manufacturer of arsenic, the promoter of the Canadian thistle, and the local agent of the imported rattlesnake. The various uses to which it can be put are obvious and numberless. As a missile in a riot—the impeller wearing a glove, but the other person having nothing to guard his face and eyes—its field of usefulness will be wide and fertile. Small fragments of it attractively displayed here and there about the city will give a rich return of agony when thoughtlessly picked up. For village sidewalks inimical to the thin shoe of the period it would be entirely superior to the knotty plank studded with projecting nail heads. With a view to these various “uses of adversity,” it would be well for Professor Hanks to submit careful estimates of the cost of quarrying it and transporting it to places where it can be made to do the greatest harm to the greatest number. To assist and further the purposes of Nature, as manifested in the character of the several agencies and materials which she employs, is the greatest glory of science. A human being assailed by all the natural forces, seizing a stone to defend himself and getting a fistful of pectolitic spiculæ, is a spectacle in which one can get as near and clear a glimpse of the Great Mystery as in any; and science is now prepared to supply the stone. LA BOULANGÈRE