Walter BROWN of High St., Portland (St. John) received from Buenos Ayres yesterday the sad intelligence of the death of his eldest son, William BROWN. The accident occurred 4th Feb. The deceased was going down a ladder into the hold of barque "Algeria" with a saw in his hand to do some repairs, when it is supposed he slippedand fell headlong to the bottom breaking his neck. The body was interred at Buenos Ayres. The deceased joined the vessel in St. John and shipped as carpenter. He sailed from the port September last.