640 Ganong. — An Undescribed Thermometric Movement of 
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Fig. 57. 
Abscissa spaces of upper five polygons, each two days ; of lower six polygons, one half-day. 
Ordinate spaces, each 2 mm. of movement (thus differing slightly from two preceding plates) and 
1 degree of temperature, and 1% of water (for lower polygon). 
Downward direction means inward of the shrub, and upward means outward. 
The plate shows the movement of the branches of Linder a Benzoin , the north, south, east, and 
west branches being indicated by the initials N. 3 . E. W. 
The upper four polygons show the movement through the season, and the four below them show 
it upon a larger lateral scale through the period of greatest secondary movement. 
The double line represents temperature. 
The lowermost line represents the percentage of water contained in Salix. 
(On irregularities in this plate see note on page 644.) 
