CONTENTS. 



SECTION I. 

 NATURAL HISTORY OF PARASITES IN GENERAL. 



CHAPTER I. 

 NATURE AND ORGANIZATION OF PARASITES. 



PAGE 



Definition General scope of the Subject Pseudoparasites Degrees and 

 Varieties of Parasitism Form of the Body Organs of Fixation and 

 Locomotion Commensalism, . . . . . . 1-9 



CHAPTER II. 

 OCCURRENCE OF PARASITES. 



Abundance Distribution Respiration and Respiratory Organs Ectoparasites 



and Entoparasites Nutrition and Mouth-Organs Encystation, . . 10-21 



CHAPTER III. 



THEORY OF THE ORIGIN OF PARASITES REGARDED 

 HISTORICALLY. 



Theory of Spontaneous Generation Heterogeny Linne and Pallas Hypothesis 

 of Inheritance The School of Rudolphi First Proof of Metamorphosis in 

 Trematodes and Cercaria Eschricht and Steenstrup Discoveries of 

 Dujardin, von Siebold, and van Beneden Introduction of Helminthological 

 E xperiment by Kuchenmeister Its further development, . . 22-41 



CHAPTER IV. 

 LIFE -HISTORY OF PARASITES. 



Sexual Maturity Eggs and Embryos Developmental Stage of Eggs when laid 

 Migration of the Eggs Worm-Nests Continuous development and 

 Reproduction (Rhabditis) Haematozoa Development of the Eggs 

 externally Influence of Moisture Constitution of the Egg-Shell 

 Influence of Temperature Duration of development, . . . 42-57 



Migration of the Young Brood Eggs with contained Embryos Escape of the 

 Embryos after digestion of the Shell Escape from the Host Free Embryos 



