— 42 — 



water which has condensed on the surface of these cells. 

 The openings to these cavities cover from one third to 

 one half of the surface of the leaf and are partially 

 closed by short hairs lying horizontally across. By this 

 arrangement it is possible that some part of the water 

 collecting as dew on the leaf surface may be retained 

 and drawn into the cavities in the same manner we 

 have supposed this to take place in the case of filzig 

 leaves. 



The hairs accompanying the stomata in the furrows 

 of Erica are thicker walled and show no life-reaction 

 on the application of salt-solution. 



In conclusion, it may be said, that if the importance 

 of the form of the stomata and their position in respect 

 to the other epidermis cells has not hitherto been overrated, 

 as regards their power in regulating the amount of water 

 thrown off by transpiration, the facts observed furnish 

 a strong probability that in the majority of so-called 

 „ filzige Blatter " a special arrangement exists for making- 

 use of the moisture in the atmosphere. Lack of time 

 has prevented the attainment of more definite results. 



