. Ml I ... 



;ni<l ingeniously Btaincd for potassium b; tanitrite B 



;i means the potassium Btaius intense black. In • ■ I i cal 



accumulations of potassium occur either near the int< 



clear and the chlorophyl-containing parts of the cell or 



under a portion of the cell wall from which later a protrusion g 



t.» form the firsl Btage in conjugation. The outgrowth from the cell, 



as well as the accumulation of potassium, ma) I"- the result 



Burface tension. In unicellular animal organisms, Buch i 11a, 



much less potassium is p . being confined to th< ilia, 



which Macallum believes indicates thai the structures are produced 



an outcome of low Burface tension. 



In the cells of higher animals, deposits of potassium are a] 

 in striated muscle, for example, tl • or in a zone at each • 



doubly refractive band and immediately adjaci singly • 



tive hand. Changes in surface tension, associated with <-l. get 

 distribution of potassium, are believed bj man} I iponsible 



muscular contraction. In nerves and nerve cells, potassium 



trated al the axon and at the surfaces of tn Us. [nterestii 



in. ns are offered to explain the relationship among cha - in surf 

 tension al the terminations of axons \\ oapses, terminations in •. 

 muscle cells brought about by the uerve impulse acting as a 

 electric potential. Surface condei sation of potassium hi 

 observed al the lumen border of gland cells pan .1 on the lu- 



men Burface of the cells of the renal tubuh - Such observat 

 in what way surface tension may !>.• railed into play to coi I cellular 

 activities. The field is new and almost unexplored, but the • ilready 

 much to indicate that surface energy • I important role in the 



performance of many cellular activity 



Conditions That Influence or Are Influenced by Adsorption 



Electric Changes. Besides mere eon 

 into play to assist or retard adsorption. One of 1 

 these is electrical. Most Bolids when | 

 a negative cl if electricit ae a p l • 



the Willard Oibbs law, a constant tendency will 

 to be diminished by the neutralization of tl 



ir by deposition on the intei 

 electric charge of oppi by the action «>f tl 



Charcoal in suspension in wat 



[f colloidal iron, which has a positive cht 



will become deposited on the charcoal, as will also tl ■ 



inorganie salt. On account >>( electric adsorptii bile 



