One part tallow, one part best sperm oil, one part tar, melt the whole and apply to the leather; while hot, make repeated applications until the leather is saturated. You can apply the above in its boiling state to leather without fear of injuring it.

Waterproof Leather Boots That Will Resist The Severest Weather

Take half a pint of linseed oil, and half a pint of neat's foot oil, and boil them together. Have the boots dry, and free from dirt, rub them well with this mixture before the fire, until completely saturated; set them by for two or three days after oiling the first time; and after using, wash them clean from dirt, and oil when dry; or upon the feet, before going out. The soles of dress boots may be made impervious to wet or snow, by the same mixture.