The present incumbent of this reapomsible office, Mr. Holt, has " won golden opinions" from the inventors of our country during the brief term of his official career. The principle enunciated in behalf of the rights of inventors in his famous decision in the Goodyear india-rubber case has attracted much attention. Samuel L. Denny, an enthusiastic inventor residing in Pennsylvania, writes to us, proposing that all the inventors who receive Letters Patent during Mr. Holt's term of office, should each deposit the sum of one dollar in the hands of Munn & Company, to constitute a fund wherewith to purchase and present to him a superb testimonial upon his retiring from the office. We have no doubt should this proposition be fairly presented to such patentees that it would meet a most hearty response. Mr. Holt, however, we imagine, has no taste for any such demonstration, and in regard to ourselves, we should not desire to becomeresponsible for any sums of money not intended for our legitimate business. PREPARATION FOR THE HAIR.—The French are not only remarkable for their inventive genius, but also for the direction it sometimes takes. A manufacturer in the south of France advertises a preparation which he calls Eau de Noblesse, and declares that it makes the hair always preserve an " honorable" direction, and gives to the person who uses it , an "air of distinction and supremacy."