[30] Part I. sect. 10.
[31] I do not here enter into the question debated among physiologists, whether pain be the effect of a contraction, or a tension of the nerves. Either will serve my purpose; for by tension, I mean no more than a violent pulling of the fibres which compose any muscle or membrane, in whatever way this is done.
[32] Part II. sect. 2.
[33] Part II. sect. 1.
[34] Part I. sect. 7. Part II. sect. 2.
[35] Part II. sect. 7.
[36] Part II. sect. 10.
[37] Part II. sect. 3.