Pascal’s health about this period appears to have undergone a change for the worse. He suffered from excessive headache and great internal heat and pain. A singular characteristic of his malady was his inability to swallow water unless it was heated, and even then only drop by drop. He was the subject, also, of a remarkable paralytic seizure thus described by his niece:—
“He fell,” she says, “into a very extraordinary state, as the result of his great application to his scientific studies; for the senses (_les esprits_) having mounted strongly to the brain, he became in a manner paralysed from the waist downwards. His legs and feet grew cold as marble; and they were obliged every day to put on socks soaked in brandy in order to try and restore heat in his feet. At the same time the physician interdicted him from all study.” { 23b}
M. Lélut { 23c} explains at length this attack of Pascal’s as a well-known form of dynamical paralysis, of a similar nature with hypochondria and hysteria, proceeding from a disordered state of the nervous affections, the result of overwork acting upon a delicate organisation. The result is temporary, as distinguished from the paralysis arising from organic lesion, but indicates a highly susceptible constitution, the ready prey of melancholy and imaginative exaggeration, to which, in M. Lélut’s opinion, Pascal was more or less liable during the remaining years of his life.
CHAPTER II. PASCAL’S SCIENTIFIC DISCOVERIES.
Pascal’s scientific studies may be said to have begun with the remarkable incident of his youth already related, when he elaborated for himself, in a solitary chamber without books, thirty-two propositions of the first book of Euclid. On the other hand, these studies may be said to have extended to his closing years, when (in 1658 and 1659) he reverted to the abstruser mathematics, and made the _cycloid_ a subject of special thought. But his scientific labours were in the main concentrated in the eight or ten years of his life which followed the removal of the family to Rouen. It will be convenient, therefore, to notice these labours and discoveries in a single chapter here, which will, at the same time, carry on the main history of his life during these years. All that can be expected from the present writer is a slight sketch of this part of the subject, which indeed is all that would be interesting to the general reader.