. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 328 F. R. HUNTER 0- LJ Q , io- 20-. min .8min. FIGURE 5. Erythrocytes of German brown trout were equilibrated in 200 tmi glyc- erol in NaCl (1:10 v/v). ml of this cell suspension were added to 10 ml of NaCl plus: mM glycerol; HIM G; HIM G; HIM G; and mM G. The initial steep portion of each curve is plotted on rectilinear coordinates. Horizontal lines represent equilibrium volume in each case. The times for the lines drawn through the initial points to intersect t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 328 F. R. HUNTER 0- LJ Q , io- 20-. min .8min. FIGURE 5. Erythrocytes of German brown trout were equilibrated in 200 tmi glyc- erol in NaCl (1:10 v/v). ml of this cell suspension were added to 10 ml of NaCl plus: mM glycerol; HIM G; HIM G; HIM G; and mM G. The initial steep portion of each curve is plotted on rectilinear coordinates. Horizontal lines represent equilibrium volume in each case. The times for the lines drawn through the initial points to intersect the horizontal lines were measured using graphs such as these. These times are indicated beside each line. In mammalian red cells where there is a carrier for urea which also carries thiourea, relative penetration times for these twro substances are reversed. Urea penetrates very rapidly and thiourea enters much more slowly. Another interesting comparison is that ethylene glycol enters the cells of the four trout species by simple diffusion much more rapidly than this molecule enters cells of some species of mammals where a carrier is involved. This might suggest that during the course of evolution, with the addition of carriers to the red cell membrane, the movement of urea was speeded up at the expense of a chemical change in the membrane which slowed down the movement of other molecules. The author is indebted to the Faculty Research Committee of the University of the Pacific for a grant in support of this work. He also wishes to express his appreciation to Dr. Gerald E. Svendsen of Miami University for identifying the animals used in this study. Mr. Ray McDonald of the Roaring Judy Hatchery at Almont, Colorado kindly supplied the cutthroat trout used for the exit studies. SUMMARY Using a densimeter technique, a kinetic analysis was made, employing both entrance and exit studies, of the permeability of erythrocytes of brook trout (Salrclinus fontmalis), rainbow trout (Solino
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