Phenolic Solutions by Seeds of Hordeum vulgare. 133 

 Table IX. 





Absorption constant k 

 at 19° C. 



Surface tension at 

 C. 



Product constants at 19° C. 

 k x surface tension. 



Water 



'024 



71 -8 



1-72 



N/2 phenol 



-045 



-13 3 



1 -94 



N/2 catechol 



0-029 



56 -3 



1 -64 



N/2 resorcinol 



0-026 



63 -8 



1 -66 



N/2 quinol 



026 



63 -7 



1 65 





0-024 



69 -8 



1 -68 



111 the same way the product constant for the seminormal phenolic 

 solutions at 32 - 2° C. has an approximate value of 3"1, and for the solutions 

 of ordinary phenol of various strengths a value of about 4 - 0.* 



(b) Viscosity.- — The viscosity of the solutions was measured by means of 

 an Ostwald viscometer of about 20 c.e. capacity, the correct temperature 

 being maintained by immersing it in the same thermostat as was used for 

 the surface tension determinations. The relative viscosity only was found, 

 in terms of water at the same temperature, the usual formula 



a = t'd'/td 



being employed ; t' and d' being the time of How and density for the 

 si ilution ; t and d representing the same for water. 



The results are given in Table X. An inspection of them shows that the 

 variation in viscosity of the solutions between themselves is too slight to 

 account for the large variations in the absorption rates. Apparently, the 

 viscosity of the solution is a factor of no importance ; and even if it exerts 

 a small effect on the rate of diffusion across the membrane, it is completely 

 masked by other factors. Indeed, all the phenolic solutions, which have 

 a slightly greater viscosity than water, tend to diffuse across the membrane 

 more rapidly than the latter. 



Table X. 



Viscosity. 



Temp. 19° C. 



Temp. 32 -2° C. 



"Viscosity at 

 26 -6° C. 



Water 



N/2 phenol.... 

 N/2 catechol . 

 N/2 resorcinol 



N/2 quinol 



N/2 pyrogallol 



1-000 

 1 -111 

 1 -122 

 1 -119 

 1 -120 

 1 -129 



000 

 099 

 119 

 118 

 117 

 130 



N/2 phenol 

 N/4 

 N/8 

 N/16 

 N/42 

 Water 



1 -no 



1 -066 

 1 -051 

 1 -012 

 1 -001 

 1 -000 



* Since the samples of seeds were different and the initial moisture-content not the 

 same, these constants are not comparable with one another. 



VOL. LXXXIX. — B. M 



