NUTRITION LABORATORY. 287 



former mechanician, Junkunc, now in Chicago, With this apparatus 

 the distance traveled by a dog may be accurately measured; it may 

 also be used for securing certain amounts of exercise or muscular work 

 in experiments with animals in which known amounts of work are to 

 be performed. 



Respiration apparatus for small animals. — The unit form of respira- 

 tion apparatus has also been adapted to the study of small animals by 

 using a chamber with a swinging cage for recording the movement of 

 the animal. The accuracy of the apparatus has been demonstrated by 

 the usual tests. With this respiration apparatus experiments may be 

 carried on without interruption for several days and the animal main- 

 tained in an artificial atmosphere as long as desired. During the past 

 year the apparatus has been used for an extensive series of experiments 

 on the gaseous metabolism of rabbits living in an atmosphere of nearly 

 pure oxygen. By using a spirometer, accurate measurements of the 

 oxygen consumption were obtained. 



Apparatus for photographicregistration. — The Laboratory has acquired 

 an unusual collection of apparatus for photographic registration, in- 

 cluding the Blix-Sandstrom kymograph with photographic registration 

 appliances, the kymograph of Frank, the Edelmann-Morse apparatus, 

 the apparatus employed by Thoma with the oscillograph, and that used 

 with the string galvanometer manufactured by the Cambridge Scien- 

 tific Instrument Company. Special forms of apparatus for photo- 

 graphic registration were employed by Professor Dodge in connection 

 with his psychological observations. 



Miscellaneous equipment. — The rapid accumulation of reprints which 

 are continually being presented to the Laboratory, and the necessity 

 for a moderate enlargement of the library facilities, together with the 

 increasing number of workers needed for computation, abstracting, and 

 translation, made a complete rearrangement of the library and com- 

 puting room necessary. In this rearrangement an extensive addition 

 has been made to the library shelving, and modern fireproof steel cabi- 

 nets and filing cases have been provided for the storage of the impor- 

 tant scientific records, including all original data, kymograph records, 

 and calculated material. 



COOPERATING AND VISITING INVESTIGATORS. 



Although the number of available subjects is small for studying the 

 particular problems in diabetes which at present interest us. Dr. E. P. 

 Joslin has continued his cooperation in the study of metabolism in 

 severe diabetes. 



Dr. Fritz B. Talbot has also continued his active cooperation in the 

 research on the metabolism of infants, especially in arranging for and 

 carrying out the observations on the metabolism of the new-born in 



