COMMUNICATIONS RECEIVED. acknowledges with much pleasure the re ceipt of original papers and contributione upon the following subjects : Aleo enquiries and answers from the follow ing: [OFFICIAL. Index of Inventions FOR WHICH Letters Patent of the United States WERE GRANTED IN THE WEEK ENDING April 21 1874 AND EACH BEARING THAT DATE., scientific american, 1874-05-23

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COMMUNICATIONS RECEIVED. acknowledges with much pleasure the re ceipt of original papers and contributione upon the following subjects : Aleo enquiries and answers from the follow ing: [OFFICIAL. Index of Inventions FOR WHICH Letters Patent of the United States WERE GRANTED IN THE WEEK ENDING April 21 1874 AND EACH BEARING THAT DATE., scientific american, 1874-05-23

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