Partial Thermostasy of the Date Palm 
Plate 
A cross-section of the trunk of the same date palm shown in Plates 2, 4, and 5, about 23.5 inches 
in diameter. (See white 10 cm. scale.) 
The trunk proper, stained with potassium iodide to show the starch content, is surrounded by the 
imbricated leaf bases, 7 to 8 inches broad, which form a highly nonconducting protective layer 
