io6 
W. J. V. OSTERHOUT 
B 
Fig, I. Apparatus for the demonstration of photosynthesis. Samples of the 
gas (after thorough mixing by means of the water in the bottle) are removed in the 
analysis tubes (A). 
Fig. 2. Apparatus for gas analysis. The gas is contained in A; D is filled 
with potassium hydrate and F with pyrogallol. 
