[In connection with a report of the Cambridge Examination the writer wishes to acknowledge the interest and assistance of Dr. Francis Gowland Hopkins, head of the Physiological-Chemical Department of the Physiological Laboratory of the University; Dr. George H. F. Nuttall, in charge of the Bacteriological Section of the Pathological Laboratory; Mr. Sidney W. Cole, Mr. Robert Barrett, and Dr. Hubert Higgins, both for practical work in the laboratory and in serving as test-subjects. To Dr. Higgins so much is due that it is difficult to measure. Since our first meeting in Cambridge, Dr. Higgins has been unremitting in his study of the subject and in consideration of its application to human betterment. Having the altruistic temperament inborn and not yet smothered by disappointment, the good doctor has consecrated himself to the service of poorer humanity, and his inspiration in so good a cause is wonderful motive power behind the native desire to do good. The statement of Dr. Higgins' experiences in pursuit of an Economic Nutrition is given in his own manner in the new edition of Glutton or Epicure, which is being published coincidently with this volume in the A. B. C. Life Series.

At the time we were in Cambridge, Dr. Hopkins and Mr. Cole had just published their paper in the Journal of Physiology (English), describing their isolation of the tryptophane element of the proteid molecule which had eluded chemists from the beginning. In tryptophane they found embodied the odour-ous indol and skatol which appear so offensively in the putrid decomposition of proteid. In the excreta of the test-subjects in our Economic-Nutrition-Inquiry these malodorous substances did not appear, and hence another question is opened up to investigation relative to the putridity of human excrement under ordinary conditions of carelessness, and the absence of putridity in the case of nutrition accomplished by aid of thorough buccal treatment of food preparatory to digestion.

It is a matter of interest, relative to the patience required in science, to state that Dr. Hopkins and Mr. Cole were fourteen months searching for the fugitive tryptophane element after they received their first clew to its whereabouts. When isolated, tryptophane masses in a substance having the appearance of silver, but not the solidity of that metal. - Horace Fletcher].