The seal fishery was one of the chief considerations that induced the United States to purchase Alaska. It provided considerable revenue by the lease of the privilege of taking seals, an amount that was actually more than the price paid for Alaska. From 1870 to 1890, the seal fisheries yielded 100,000 skins a year. The company to which the administration of the fisheries was entrusted by a lease from the US government paid a rental of $50,000 per annum and in addition thereto $2.62½ per skin for the total number taken. The skins were transported to London to be dressed and prepared for world markets. The business grew so large that the earnings of English laborers after the acquisition of Alaska by the United States amounted by 1890 to $12,000,000.