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Both closed their earthly career by untimely deaths. I reached home on the 14th, praising the God of Daniel for his keeping power in the lion's den. After my return my health gave way, as did also that of our worthy agent, Catherine Taylor. She endured great suffering from inflammation of the sciatic nerve, and was entirely disabled from labor for months.
Darwin's most striking case and to my mind the only case of any importance is that of Brown-Séquard's epileptic guinea-pigs, which inherited the mutilated condition of parents who had gnawed off their own gangrenous toes when anæsthetic through the sciatic nerve having been divided.
Having, by section of the roots of the sciatic nerve, and again of a lateral half of the spinal cord, produced paralysis in one hind leg of an animal while the other remained healthy, he found that not only did muscular irritability last much longer in the paralyzed limb, but rigidity set in later and ended later, and putrefaction began later and was less rapid than on the healthy side.
The unfortunate fellow had had his sciatic nerve torn by a bullet, and he had to endure the most atrocious pain. After my third fruitless appeal for silence I ordered the two men attendants to carry him into a room where he would be alone. He sent for me, and when I went to him promised to behave well all night long. I therefore countermanded the order I had given, and he kept his word.
We now tried the crucial test of passing the etheric current through the sciatic nerve of a frog just killed. Previous to trying, we tested its sensibility by the current from a single Bunsen cell. We put in resistance up to 500,000 ohms, and the twitching was still perceptible.
But I am so far from wishing these courses extended, that I think some of them suppose I say my own would almost bear curtailing. Do you want me to describe more branches of the sciatic and crural nerves? I can take Fischer's plates, and lecturing on that scale fill up my whole course and not finish the nerves alone.
Neuralgia in every conceivable form tormented her, most frequently in her back, but often, also, in her head, sometimes in her sciatic nerves, sometimes setting up a tic douloureux, sometimes causing a fearful dysmenorrhoea and frequently making her head ache for days together. At other times hysteria got hold of her, and made her fancy herself the victim of strange diseases.
By cutting the spinal cord or the sciatic nerve of guinea-pigs, Brown-Séquard brought about an epileptic state which was transmitted to the descendants. Lesions of the same sciatic nerve, of the restiform body, etc., provoked various troubles in the guinea-pig which its progeny inherited sometimes in a quite different form: exophthalmia, loss of toes, etc.
On connecting one to the sciatic nerve and the other to the fleshy part of the leg no movement could be discerned, although brilliant sparks could be obtained on the graphite points when the frog was in circuit. Doctor Beard was present when this was tried." "December 5, 1875. Etheric Force.
Those given off from the small of the back just above the hips also run together to form, first a network and then a big single nerve-cord, called the sciatic nerve, which many of you have probably heard of from the frightfully painful disease due to an inflammation of it, called sciatica.
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