Annals of Botany, 
Vol. XXXIV, PI. XVIII. 
Fig. i. The apparatus used in testing the carbon dioxide absorption by coco-nut, photographed from 
the SE. on May 28, at 5 p.m., during the test of leaf 4. 
Fig. 2. A photograph of the coco-nut tree used in testing the 
carbon dioxide absorption of coco-nut leaves at different ages. 
This was taken on the same day as Fig. 1. The leaves are 
designated by numbers corresponding to those used in the text. 
McLEAN — CARBON DIOXIDE. 
