1915] 



MERRILL — ELECTROLYTIC DETERMINATION OP EXOSMOSIS 



561 



the case of exosmosis, an experiment was set up, the results 



of which are given in table 



As there seen, there was 



decrease in the exosmosis caused by either substance when the 

 two were combined. 



TABLE XIII 



EFFECTS OF SALT SOLUTIONS USED SINGLY AND COMBINED WITH ANESTHETICS 



ON THE EXOSMOSIS FROM THE ROOTS OF TREATED PLANTS* 



Culture 

 no. 



1 



2 



3 

 4 



5 



Treatment 



Conductivity 



Readings 



Increase over dist. H 2 



After 

 §hr. 



1/8 saturated CHCla in 

 H s O,44hrs 



M/200 chloral hydrate, 

 44 hrs 



6 



7 



8 



9 

 10 

 11 

 12 



N/10 NaCl, 44 hrs 



N/10KC1, 46 hrs..... .. 



1/8 saturated CHCla in 



HiO&N/10NaCl,44 



hrs 



1/8 saturated CHCh & 



N/10 KC1, 46 hrs 



M/200 chloral hydrate 



& N/10 NaCl, 46 hrs.. 

 M/200 chloral hydrate 



& N/10 KC1, 46 hrs . . 

 N/10 NaCl & N/10 



KC146hrs 



N/20 NaCl & N/20 



KC1, 46 hrs 



Control (dist. H2O re- 

 newed every 2 days) . . 

 Control (dist. H2O not 



renewed) 



8.5f 



13. 4f 



38. 4f 

 53.6 



46.2 

 47.2 

 49.1 

 60.5 

 70.7 

 41.8 

 11.4 

 16.7 



After 

 41 hrs. 



11.0 



18.9 

 59.3 

 76.2 



61.6 

 76.5 

 79.3 

 84.2 

 82.7 

 71.7 

 10.8 

 25.0 



1st 



|hr. 



1 Next 

 40£ hrs. 



2.5J 



2.5 



7.4J 

 32. 4$ 



47.6 



5.5 

 20.9 

 22.6 



40.2 



15.4 



41.2 



29.3 



43.1 



30.2 



54.5 



23.7 



64.7 



12.0 



35.8 



29.9 



5.4 



-.6 



10.7 



8.3 1 



Total 

 in 41 hrs. 



5.0 



12.9 



53.3 

 70.2 



55.6 

 70.5 

 73.3 

 78.2 

 76.7 

 65.7 

 4.8 

 19.0 



* All readings represent values of x on the Wheatstone bridge with a resistance 

 in the box of 9,110 ohms. 



t Reading taken after 50 minutes. $ Increase in first 50 minutes. 



|| The average reading of the distilled water before placing roots in it was 

 approximately 6.0. 



Merely to get a basis of comparison between the effects pro- 

 duced by the various agents above mentioned and acid and 

 alkali in certain concentrations, plants were placed in solu- 

 tions of KOH and H2SO4 of approximately the limiting con- 

 centrations for root growth, as found by Kahlenberg and True 

 ( '96). Instead of excretion being greater than absorption the 

 reverse was found to be true during the period the plants re- 



mained in the 



plants, to all external 



not affected adversely in the least, and when late 



