"I had gone to take a walk," he said, "on a fine Sabbath afternoon. I had entered the Green by the gate at the foot of Charlotte Street, and had passed the old washing-house. I was thinking upon the engine at the time, and had gone as far as the herd's house, when the idea came into my mind that, as steam was an elastic body, it would rush into a vacuum, and, if a communication were made between the cylinder and an exhausted vessel, it would rush into it, and might be there condensed without cooling the cylinder." He had found it! Before he had crossed the Green, he added, "the whole thing was arranged in my mind." Since that memorable day the invention has been ever growing; for, as Professor Thurston well remarks: "Great inventions are never the work of any one mind." From Hero to Corliss is a stretch of nearly twenty centuries; during which, probably, a thousand inventive minds have contributed to make the steam-engine the exquisite thing it is to-day. AN OLD DRY-GOODS MERCHANT'S RECOLLECTIONS. Our great cities have a new wonder of late years. I mean those immense dry-goods stores which we see in Paris, London, New York, Vienna, Boston, Cincinnati, Chicago, in which are displayed under one roof almost all the things worn, or used for domestic purposes, by man, woman, or child. What a splendid and cheering spectacle the interior presents on a fine, bright day! The counters a tossing sea of brilliant fabrics; crowds of ladies moving in all directions; the clerks, well-dressed and polite, exhibiting their goods; the cash-boys flying about with money in one hand and a bundle in the other; customers streaming in at every door; and customers passing out, with the satisfied air of people who have got what they want. It gives the visitor a cheerful idea of abundance to see such a provision of comfortable and pleasant things brought from every quarter of the globe. An old dry-goods merchant of London, now nearly ninety, and long ago retired from business with a large fortune, has given his recollections of business in the good old times. There is a periodical, called the "Draper's Magazine," devoted to the dry-goods business, and it is in this that some months ago he told his story.