157 
' . А ce à T" 3 « P. s ба 
Curves of Growth of the two terminal zones and the remaining portion of the female flower-stalk of Vallisneria spiralis, Linn, Б 
А. Grand eurve of growth of the two terminal zones; B. Grand eurve of growth of the remaining portion of flower-stalk. Оп the line of abscisse every 
2 ineh represents a period of 12 hours; on the ordinates every inch represents a growth at the rate of 1 per cent. per hour. The figures above 
= each ordinate express the growth of curve A, those below the ordinate the growth of curve B on this notation. The ordinates are erected from the 
ш centres of the several periods of time, a, b с, &c. 
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