A circular has been sent to all the mechanics' institutes in Upper Canada, by the Board of Arts and Manufactures, informing them of its objects and asking their co-operation. This Board has especially for its aim the increase of the knowledge of the mechanic arts, and it now proposes to form a library and museum of inventions, models and patents, which will no doubt form the nucleus of a valuable educational system. Exhibitions are to be held and prizes distributed for inventions of practical utility for the purpose of stimulating the inventive genius of tho country. We wish them a hearty success and hope that an honest rivalry may spring up in this branch of industry between them and our northern States, so that both may thereby be benefited, and liberality and good feeling increased.