TABLE OF CONTENTS 



V Page 



Introduction 7 



Materials and Methods of Study ' 7 



Acknowledgments 8 



Experimental Data 9 



Toxity of Cupric Chloride, Cadmiimi Chloride, Ferric Chloride, Colloidal Copper, 



and Distilled Water 35 



The Efficiency of the Goldfish as a Test Animal 40 



The Effect of Temperature upon the Resistance of the Goldfish ........!.... 42 



Toxicity and the Expression of Relative Toxicity .....' 42 



Is the Toxicity of a Substance Due to Osmotic Pressure 46 



Theory of the Poisoning Effect of Toxic Substances .....: 46 



A Comparison of Curves Obtained by other Workers 52 



Discussion of Data „... 54 



Smnmary of Conclusions j^. 66 



Bibliography 69 



