1 IN T TîODU C TI Oil. The importance of keeping in close touch with as many investigators as possible in the field of metabolism in Europe as well as in America cannot be too greatly emphasised. A certain number of individuals can become fa¬ miliar with the work of the nutrition Laboratory through personal inspection and the conduct of researches therein, and a larger number can read the re¬ ports. There still remains, however, a large number of individuals who cannot obtain an adequate idea of the work of the Nutrition Laboratory, or, indeed, of the opportunities offered there for work, without personal asso¬ ciation with some member of the laboratory staff. This is particularly true of foreign investigators. The periodic tours in Europe which have been made by members of the Labo¬ ratory staff serve a number of well-defined purposes. First, they enable the representative of the Nutrition Laboratory to find out all that is new in the equipment and design of foreign laboratories and apparatus. This point was especially emphasized during my tour in 1907. Innummerable points in connection with the construction and equipment of foreign laboratories and apparatus we re found invaluable in the final arrangement of the Nutrition Laboratory. Second, while a scientific investigator may write a description of his apparatus in the most beautiful language, he will, without fail, inadvertently overlook certain important minor details, which, though they may not affect the principle or the apparatus, nevertheless play a very important rôle in tne successful conduct of experiments with it. Hence, a personal inspection ana an examination of the methoa3 used by its originator are often of very great value.