An accident occurred yesterday week to Mr. H. Cooper, a carpenter in the employ of Messrs. Whittington and Tomlin, Queen-street. Mr. Cooper was engaged in the erection of a shed at Messrs. Wm. Green and Son’s factory, when the ladder slipped and he was precipitated some 20 feet to the ground. Fortunately his fall to the ground was broken by some boxes, or his injuries would doubtless have been of a more serious character. As it was, however, no bones were broken, although Mr. Cooper sustained slight concussion and a dislocated shoulder. He was attended by Dr. Owen. Enquiries made yesterday elicited the fact that Mr. Cooper is making satisfactory progress towards recovery.