59 
Vo In none of these experiments was there a vestige of oxygen air, this 
being partly absorbed by the plant, and partly converted into fixed 
air. 
VI. From the experiment with the oxygen air there remained 10 cubic 
inches; 2 cubic inches were therefore absorbed, 3 were converted into 
fixed air, and the residue was oxygen air> but reduced to l6o degrees 
of goodness. 
CONCLUSION from these EXPERIMENTS. . 
Hence, says Dr. Ingenhousz, we are warranted in this conclusion, 
I. That atmospheric air is useful to vegetation only on account of the oxygen 
air which it contains. And, 
II. That the mephitic airs are adverse to growth only as not containing in 
their composition oxygen air. 
III. That oxygen air is not only favourable to the growth of plants, but also 
still more so than atmospheric air. 
IV. That oxygen air is the true pabulum of vegetable, as of animal, life. 
