APPENDIX 



489 



NOTE 21 (pp. 149, 183). 



ADDITIONAL RESULTS SHOWING THE BEHAVIOUR OF DIFFERENT 

 SUBSTANCES AFTER EXPOSURE TO A TEMPERATURE OF 100 C. 



These results will serve to bring out the contrast between mineral 

 substances containing a little water, as chlorite and opal, air-dried 

 vegetable substances, as rice of commerce, and living plant materials, 

 as fresh leaves and green wood, when they are subjected to a temper- 

 ature of 1 00 C. for some hours and are then exposed to the air for 

 some days. The chlorite and opal had little to lose in the oven, and 

 gained most or all of it back from the air. The rice behaves like other 

 air-dried plant-substances in regaining from the air the water lost in the 

 oven, the small deficit being probably connected with hygroscopic 

 variation. On the other hand, fresh leaves and living wood gain 

 back but a small proportion of what they lose in the oven. What 

 is not regained is the water of vitality. What is regained is the 

 water of hygroscopicity, and this is the only water the rice holds in 

 the ordinary air-dried state. 



I may remark that the data given in the table on page 183 in the 

 case of the second experiment on Hazel leaves are merely resorption 

 results after the oven test. 



NOTE 22 (pp. 198, 324). 

 The drying regime of Swietenia Mahogani. 



THIS is dealt with on p. 324 for the fruit as composed of pericarp 

 and seeds. In Note 28 on p. 494 the placental axis or columella is 

 differentiated from the pericarp in the process. 



