JOHN MARSON, Gunsmith. - Among the industrial avocations which characterize the business and mechanical operations of Cambridge City, we mention that of Mr. John Marson, who is a practical gunsmith and dealer in guns, pistols, amunition and hunters' outfits. Mr. Marson is a native of England, where he was born in 1817. He was regularly indentured to a gunsmith in his native country, where the most thorough and complete knowledge is exacted of apprentices. He has had a practical experience of over 30 years in this line of business and is an expert workman and manufacturer of rifles. He also gives special attention to every description of repairs associated with fire arms.