as for that benefit not being the sensation of something like the teeth in the bones of the skull then these are benefited from in the benefits that we mentioned when we dissected the bones of the skull and they are also benefited from in the dissolution of the vaporous waste in the brain from them and likewise the spinal cord for it was created for what we mentioned in the dissection of the bones of the back of the spine of its benefits and despite that it is benefited from in the dissolution of some of the waste of the brain from it and likewise the one who is afflicted with scabies his scabies are in the lower part of his back near his rump and the tip of his coccyx. because the one who is close to scabies must have hot papery materials and what evaporates from them is like that therefore this evaporation from them increases in his brain and what is pushed from that in the spinal cord increases to its tip and that is at the end of the coccyx and therefore much of what has a lot of black spots occurs to him at the tip of his coccyx which is thick. the expression of the book in the rest of the chapter is clear. and allah is the grantor of success.
وأما تكون تلك المنفعة ليست هي الإحساس لشيء كالسنون التي في عظام القحف فإن هذه ينتفع بها المنافع التي ذكرناها عند تشريحنا لعظام القحف وينتفع بها مع ذلك في تحلل الفضول البخارية التي في الدماغ منها وكذلك النخاع فإنه خلق لما ذكرناه في تشريح عظام الصلب من منافعه ومع ذلك فإنه ينتفع به في تحلل بعض فضول الدماغ منه، وكذلك فإن الذي يعتريه الجرب يكون جربه في اسافل ظهره عند عجزه، وطرف عصعصه. لأن الذي يقربه الجرب لا بد من أن تكون مواده حارة بورقية فيكون ما يتبخر منها كذلك فلذلك يكثر هذا التبخر منها في دماغه، ويكثر ما يندفع من ذلك في النخاع إلى طرفه، وذلك عند آخر العصعص ولذلك فإن كثيرا مما تكثر فيه السوداء يعرض له عند طرف عصعصه غلظ. وعبارة الكتاب في باقي الفصل ظاهرة. والله ولي التوفيق.