Chapter II. — On the Quantity of Moisture Evaporated through 



the Stomates of the Leaves, - - - - 21 



Facts illustrative of the quantity of moisture evaporated through the 

 stomates of leaves are cited from Marsh and others, embracing 

 observations on the Oik by Marshal Vaillant (p. 21), and on the 

 maple and the birch in Am?rici (p. 22). 



Chapter III. — Disputed and Secondary Phenomena of Vege- 

 tation, - - - - - - 25 



Section I. — On the Absorption of Moisture by Leaves, - 25 



It is alleged that there is a lack of evidence of moisture being absorbed 

 by leaves in great quantity (p. 25). 



Section II. — On the Production of Water by Plants, - - 26 



A reference is made to quantities of water found in the KaflSr iron- 

 wood (p. 26), the pitcher plant and the teazle (p. 27), to water 

 secreted by ants (p. 28) and by the cuckoo-spit (p. 29) ; and it is 

 intimated that it is not unreasonable to suppose that water may be 

 secreted by vegetables (p. 31). 



Section III. — On the Dropping of Water from the Leaves of 



certain Trees, - - - - - -31 



Eeference is made to observations on a cehbrated laurel in Fervo 

 (p. 31), and it is su^gest>-d that the dropping of water fiora its 

 leaves may be attributable to a c ipiims deposit of dew (p. 32), and 

 this is again relerred to in explanation of similar phenomena ob- 

 served in Madeira (p. 35) and in Europe (p. 37). 



PART II. — Effects op Forests on the Humidity of the 



Climate, - - - - - - 38 



Chapter I. — Immediate Effects of Forests on the Humidity of 



the Atmosphere, - - - - - 38 



Keference is made to controverted views on this subject, and these are 

 discussed (p. 38). 



Section I. — On the Humidity of Atmosphere in the vicinity of 

 Trees, indicated by the dampness of houses overshadowed 

 by Trees, or situated in close proximity to a Wood, - 39 



This is attributed to the moisture evaporated throujjh the stomatea of 

 the leaves being absorbed or retained by the walls (p. 39). 

 Section II. — On Clouds occasionally seen surmounting Woods 



while the Atmosphere around is comparatively clear, - 40 



There is discussed a statement by Marsh in favour of the popular 

 ▼iew that mountains attract clouds (p. 46) ; and phenomena seen 



