Printed in the United States of America by THE FERRIS PRINTING COMPANY, NEW YORK. Sarnac had worked almost continuously for the better part of a year upon some very subtle chemical reactions of the nervous cells of the sympathetic system. His first enquiries had led to the opening out of fresh and surprising possibilities, and these again had lured him on to still broader and more fascinating prospects. He worked perhaps too closely; he found his hope and curiosity unimpaired, but there was less delicacy of touch in his manipulation, and he was thinking less quickly and accurately. He needed a holiday. He had come to the end of a chapter in his work and wished to brace himself for a n…
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