This section of the book is from "The Complete Herbalist" by Dr. O. Phelps Brown. Also available from Amazon: The Complete Herbalist: The People Their Own Physicians By The Use Of Nature's Remedies.
When a person is subjected to extreme cold, the first symptoms are painful feelings, followed by sensations similar to those produced by inhalation of carbonic acid gas. He becomes benumbed, indifferent to the danger of his situation; the muscular system becomes enervated, step grows tottering, speech imperfect; and as these influences increase, the breathing becomes irregular and slow, the muscular powers fail, and he sinks into a state of insensibility and death.
TREATMENT. -- Rub the person with snow if practicable, or the whole body may be submerged in cold water for a short time. These applications should be gradually increased in temperature until the surface approaches a natural state, or the muscles and joints are sufficiently relaxed to admit of free motion. Then resort to artificial respiration as in drowning.