فَاعْلَم أَن الْحس فِي طَرِيق الْبطلَان وَأَن الْبرد قد عمل فِيهِ فليدبر مِمَّا تعلمه الان. وَأما إِذا عمل الْبرد فِي الْعُضْو فأمات الْحَار الغريزي الَّذِي كَانَ فِيهِ وحقن مَا كَانَ يتَحَلَّل مِنْهُ فِي جوهره وَعرضه للعفونة فَرُبمَا احْتِيجَ أَن يفعل فِي بَابه مَا قيل فِي بَاب القروح وخصوصاً الأكَالة الخبيثة
it is a sign that the sensation is already being lost, and the frost is already exerting its harmful action upon it. In such a case there must be no hesitation in action. For you know that once the (freezing) cold penetrates into a member, not only is the innate heat extinguished, but the very substance on which that heat depends is destroyed (dissolved, tahallul). The tissues are then at the mercy of putrefaction. So there is an urgent need for all those measures which have been discussed in the chapter on ulcers, especially the grave eroding ulcers