This case is reported because of the unusual finding of 9.73 per cent. of free cholesterol in fluid obtained from the pleural cavity, the cholesterol constituting 56.1 per cent, of the total solids of the fluid.
A Russian Hebrew, aged 62, formerly a merchant, came to the Vanderbilt Clinic in September, 1916, complaining of a cough and sticking pain in the chest, of six days' duration. He felt entirely well in all other respects, did not think he was at any time feverish, and had his usual weight and strength. The family history was not relevant. The patient's habits always had been good. The past history was negative, except that, forty years before, the patient had had pneumonia associated with fluid in the right chest, which was once aspirated. His physician wanted to repeat the aspiration, but the patient objected, and fully recovered his health and strength without repetition of