534 
Richards . — The Respiration of 
both that of Godlewski 1 and of Stich 2 was employed. In 
this case the 0 2 absorbed was not measured by the diminished 
gas-volume in the receiver, but samples of the air in it were 
taken and analyzed directly for the C 0 2 and 0 2 which they 
contained. The apparatus was exceedingly simple, and 
thereby the sources of error arising from its use the more 
A, Large vessel filled with water. B, Receiver for plants. C, Rubber-balloon. 
D, Capillary-tube leading to mercury bath. E , Tube leading to air-pump. 
Rubber indicated by shading ; iron by heavy lines ; all else glass. 
easily eliminated. A bottle of some 750 cc. capacity was 
selected, the neck of which was not shallow, and preferably 
ground, and to this a deep stopper of soft rubber, perforated 
with two holes, was fitted. Through one of the holes was 
passed a capillary barometer-tube, one end of which reached 
almost to the bottom of the vessel, the other end leading off 
under a mercury-bath, being closed, however, near to the 
1 Pring’s Jahrb., Vol. xiii, p. 491, 1882. 
2 1. c., p. 7. 
