1912.] Absorption of Water by Seeds of Hordeum vulgare. 551 



water and especially by the active by drone molecules in chemical inter- 

 actions has been frequently emphasised by H. E. Armstrong in various 

 recent communications to the Society, and the above views are in complete 

 harmony with the explanations recently advanced by Armstrong and 

 Worley in discussing the nature of hydrolytic change. 



.Experiments with Aqueous Solutions of Ethylie Acetate. 

 Ethylic acetate belongs to the class of solutes (Hormones) which are 

 capable of penetrating the seed covering, and it is further remarkable on 

 account of its power of accelerating the velocity with which water enters the 



In view of the results previously described in this paper it appeared 

 desirable to study the velocity with which water is absorbed at different 

 temperatures in the presence of the acetate. 



Table III. 



Temp. 34 -6°. 



Temp. 21 -1°. 



Temp. 3 -8°. 



Time. 



Water absorbed. 



Time. 



Water absorbed. 



Time. 



Water absorbed. 



4-50 

 23 -50 

 47 -75 

 71 -00 

 95 -50 



per cent. 

 19 -38 

 38 -48 

 45*26 

 45-98 

 44-06 



hrs. 



4-75 

 23 -83 

 48-00 

 71 -50 

 95 -75 



P 11^82 t " 

 29 -22 

 41 -12 

 44-42 

 45 -58 



5^08 

 24-25 

 48 -33 

 71-75 

 96 -00 

 143 -75 



per cent. 

 5-28 

 15 12 

 23 58 

 29-32 

 34 -16 

 40-84 

































































/ 







































Diagram III. 

 * Loc. at., p. 92. 



2 Q 2 



