10 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[130 



showed very slight signs of life. All goldfish when taken out of a solution for 

 dead were tested by placing them in a hydrochloric acid solution and if any 

 signs of life were evidenced the goldfish was designated by an asterisk in 

 experimental data as not dead. No corrections have been made either 

 in this or subsequent tables or graphs since it was deemed as being within 

 experimental error as well as within individual variation of the goldfish. For 

 further discussion of the uniformity of the survival time of the goldfish see 

 page 40. By a close examination of data of killing goldfish in different con- 

 centrations of hthium chloride (Table I) it is found that the survival time of 



Minutes. 



100 



t 



14 



13 



12 



11 



10 



9 



8 



7 



0.05. 0.1. "^ 0.15. 0.2. 0.25. 0.3. 0.35. 0.4. 0.45. 0.5. 0.5SN. 



Figure 1. Lithium chloride. LIJM is the survival time curve. The survival time of 

 the goldfish is plotted as ordinate and the concentration of the LiCl as abscissa. The crosses 

 (+) are located from actual experimental data. CAEG is the velocity of fatality curve. The 

 concentration of the LiCl is plotted as abscissa and the reciprocal of the survival time in 

 minutes or the velocity of fatality is plotted as ordinate. Instead of 1 over the survival time 

 which gives the reciprocals, 100 over the survival time is used to avoid the use of fractions. 

 The circles (•) are located by calculations from actual experimental data. The numbers 

 at the left hand of the graphs represent minutes of survival time and those at right hand side 

 of graphs represent units of velocity of fatality. The line PABF is the theoretical velocity 

 of fatality curve and is a straight line. HIJK is the theoretical survival time curve. 



