NUTRITION LABORATORY. 239 



possible to determine the true temperature of the enviromnent in which 

 these cold-blooded creatures are living during the experimental period. 



CLINICAL RESPIRATION CHAMBER. 



The success of the cUnical respiration chamber in its use both at the 

 Nutrition Laboratory and with diabetics at the New England Deacon- 

 ess Hospital warranted the construction of a third chamber with special 

 equipment for the measurement of the water of vaporization from the 

 lungs and skin of the subject. In the new chamber oil is used instead 

 of water as a seal. Lead pipes conduct the air to and from the air- 

 purifying systems, and the bed and entire equipment inside the appa- 

 ratus are of metal. Under these circumstances, the water vaporized 

 from the lungs and skin may be measured with a high degree of accu- 

 racy. This is of special importance in experiments with nude subjects. 

 As the apparatus is installed in a laboratory room which permits the 

 i-egulation of the temperature, an opportunity is afforded for the study 

 of the influence of temperature environment upon metabolism. 



PORTABLE RESPIRATION APPARATUS. 



The universal respiration apparatus, so extensively employed in this 

 Laboratory, is not sufficiently portable for transportation even about 

 the Laboratory or in hospital wards. The need for an apparatus that 

 can be moved from ward to ward or from bedside to bedside led to the 

 development in the past year of a new type of respiration apparatus 

 in which the entire equipment is installed upon an upright stand with a 

 substantial base mounted on universal castors. It can thus be quickly 

 and easily moved from one place to another and readily adjusted for use. 

 The subject can use either a mouthpiece or nosepiece attachment and 

 remarkably free and even breathing is secured. The w^hole installation 

 is simple and economical and the results obtained with it are confirmed 

 by tests with the other standard types of apparatus. The demand for 

 this apparatus has justified the Laboratory in departing from its cus- 

 tom of not constructing apparatus for sale. Seven portable respiration 

 apparatus have been constructed during the past summer. 



MINOR APPARATUS. 



Minor additions to the equipment of the Laboratory include a very 

 small double-string galvanometer, made by Dr. Miles, to be mounted 

 upon a Williams-Hindle galvanometer and used as a signal apparatus; 

 a camera arranged for continuous recording in the horizontal plane of 

 long series of eyelid movements; and an exposure apparatus to provide 

 peripheral points of stimulation for eye reactions embodying a group 

 of 28 window and shutter devices. All of these are to be used in 

 psychological research. 



