"Nothing which has transpired in the scientific world during the past year, seems to have escaped the attention of the industrious editors. We do not hesitate to pronounce the work a highly valuable one to the man of Science."--_Boston Journal._ "This is a highly valuable work. We have here brought together in a volume of moderate size, all the leading discoveries and inventions which have distinguished the past year. Like the hand on the dial-plate, 'it marks the progress of the age.' The plan has our wannest wishes for its eminent success."--_Christian Times._ "A most acceptable volume."--_Transcript._ "The work will prove of unusual interest and value."--_Traveller._ "We have in our possession the ledger of progress for 1849, exhibiting to us in a condensed form, the operations of the world in some of the highest business transactions. To say that its execution has been worthy of its aim is praise sufficient."--_Springfield Republican._ "To the artist, the artisan, the man of letters, it is indispensable, and the general reader will find in its pages much valuable material which he may look for elsewhere in vain."--_Boston Herald._ "We commend it as a standard book of reference and general information, by those who are so fortunate as to possess it."--_Saturday Rambler._ "A body of useful knowledge, indispensable to every man who desires to keep up with the progress of modern discovery and invention."--_Boston Courier._ "Must be a most acceptable volume to every one, and greatly facilitate the diffusion of useful knowledge."--_Zion's Herald._ "A most valuable and interesting popular work of science and art."--_Washington National Intelligencer._ "A rich collection of facts, and one which will be eagerly read. The amount of information contained within its pages is very large."--_Evening Gazette._ "Such a key to the progress and facts of scientific discovery will be everywhere welcomed."--_New York Commercial Advertiser._ "A most valuable, complete, and comprehensive summary of the existing facts of science; it is replete with interest, and ought to have a place in every well appointed library."--_Worcester Spy._ "We commend it to all who wish what has just been found out; to all who would like to discover something themselves, and would be glad to know how: and to all who think they have invented something, and are desirous to know whether any one else has been before hand with them."--_Puritan Recorder._ "This is one of the most valuable works which the press has brought forth during the present year. A greater amount of useful and valuable information cannot be obtained from any book of the same size within our knowledge."--Washington Union. "This important volume will prove one of the most acceptable to our community that has appeared for a long time."--_Providence Journal._