By 1870 the ship repair trade, which had served the Islands so well, was entering its final decline.  The Peruvian Guano trade had fizzled out, resulting in a drop in the number of vessels rounding Cape Horn.  Steam was beginning to replace sail, and coal could be obtained on the South American coast at two thirds of the price charged in Stanley.  The wrecking trade came into its own in this period, until Governor D’Arcy tightened laws in 1873 stopping individuals taking charge of hulks, instead giving the owners a year to make a claim.  The days of Stanley harbour as a busy port were at an end.  The colony was again forced to rely on wool as its only source of income.