;266 



SMITH : 



Time. 

 A.M. 



11. 7 



11.14 

 11.19 



Table XXIX.— December 22, 1906. 

 Codiceum variegatum. 



Black Bulb 

 Thermometer. 



C. 

 61-4 



61-1 

 60-0 



Yellow Leaf Green Leaf 



Humidity. (above Shade (above Shade 



Temperature Temperature 

 of Air). 



Per Cent. 

 64 



63 

 63 



10-1 



7-7 

 71 

 8-3 



8-7 



of Air). 

 11-8 



8-0 

 10-4 



Here the jianctions and apparatus were changed over to the other 

 leaf. 



11.40 .. 62-1 .. 58 .. 8-2 .. Tl-2 



— .. _ .. 7-4 .. 12-0 



Average of 7 = 8-2° C. ; average of ^ = 10- 7° C. 



During this experiment the two sets of apparatus were 

 interchanged, No. 1 apparatus with its junction being changed 

 from the green leaf to the yellow leaf and vice versa for No. 2. 

 This was done to test the accuracy of the two sets of apparatus, 

 and to see if they gave comparable results. The readings after 

 the change show somewhat greater differences between the two 

 leaves, and the average result is decidedly that the green leaves 

 reach a higher temperature. It amounts on the average to 

 2 • 5° C. higher for the green leaf. 



Table XXX. gives the results of experiments with the 

 variegated leaves of Caladium, sp. The species was a common 

 border plant in the gardens. Two varieties were used. 

 One was green and white, the other green and red. The 

 green and white variety had very little chlorophyll. The 

 chlorophyll present was usually along the main veins. The 

 junction was placed beneath a small side vein where there was 

 scarcely any chlorophyll. The green and red variety had a 

 thicker leaf. It was red over nearly its whole area, and 

 especially along the veins. The junction was placed beneath 

 a side vein. 



