10 Mr Barer oft, Apparatus for Analysis of the Gases, etc. 



with froth. In use the end (d) of the gas-main is drawn off; 

 (c) is blown on to the tube leading to the gas-pump. The 

 end (f) of the blood-main is blown on to the measuring burette. 

 To pump off the gases it is only necessary to open the two-way 

 taps between the chamber and the gas-main and set the gas-pump 

 going. 



Fig. 8 represents the apparatus as it appears when actually 

 in use, as also does the photograph, Plate I. The stand is made 

 to hold two receivers A and V, used for arterial and venous blood, 

 respectively. The receivers have, from time to time, had a 

 variable number of chambers, V being shewn with six and A 

 with three in the plate. 



The tube leading from the drying chamber of the pump 

 (seen in perspective and dotted in but really horizontal, or if 

 inclined, inclined in the other direction in order to let any aqueous 

 vapour which condenses fall into the lower part of the drying 

 towers) is supplied with a horizontal T-piece (%y). At x and y 

 respectively the gas-mains of the receivers are blown on, making 

 one horizontal tube the whole lerigth of the apparatus. The 

 part of the blood-main adjacent to the burette is bent through 

 an angle of 90° in the horizontal plane, in order to allow the tube 

 at the other side of the burette to project towards the table on 

 which the animal is lying. The end of this tube is shewn at e. 



It is convenient to suspend the "receivers" by strips of chamois 

 leather and drawing-pins, instead of any more rigid support, which 

 might throw a strain on the apparatus. 



Surrounding the lower " bulb " of each chamber is shewn, in 

 various positions, a bag. This bag is made out of water-proof 

 material bent on to a ring of wire at the top and gathered in at 

 the bottom. This bag is to hold warm water or warm sponges. 



The Gas Analysis Apparatus. 



In conjunction with this apparatus, the analysis of the gases 

 has been carried out by an apparatus devised and described by 

 Dr John Haldane, F.R.S. The description will be found in the 

 Journal of Physiology, Volume xxn., p. 456. 



