CONTENTS. 



PAGE 



CHAPTER I. THE DISTRIBUTION OF HEMOGLOBIN AND ALLIED SUBSTANCES IN THE ANIMAL KINGDOM . . . 1-27 



Statement of the Distribution 2 



Histohematins and Myohematins 3 



Echinochrome, Hemerythrin, and Chlorocruorin, etc 4 



Respiratory Metal-free Colorless Proteins 6 



The Distribution of Hemocyanin 7 



The Distribution of Hemoglobin in the Invertebrates 15 



Causes of the Peculiarities in the Distribution of Respiratory Pigments 18 



The Source of Hemoglobin Probably in Chlorophyl 19 



Chemical Nature of Typical Respiratory Substances, etc 20 



The Non-identity of Hemocyanins 27 



The Identity or Non-identity of Corresponding Respiratory Substances 27 



CHAPTER II. SPECIFICITY OF THE BLOOD OF VERTEBRATES IN RELATION TO ZOOLOGICAL DISTINCTION . . 29-66 



The Quantity of Blood in Relation to Body-weight in Reference to Genera 29 



The Specific Gravity of the Blood in Relation to Genera 35 



The Alkalinity of the Blood in Relation to Genera 36 



The Proportions of Sodium and Potassium in the Blood, Serum, and Corpuscles in Relation to 



Genera 39 



The Phosphoric Acid of the Ash of the Corpuscles in Relation to Genera 41 



The Proportions of Cholesterin in the Serum and Corpuscles in Relation to Genera 42 



The Proteins of the Serum in Relation to Genera 43 



The Proteins of Muscle Plasma and Seeds in Relation to Genera 45 



The Zooprecipitins and Phytoprecipitins and Immune Sera in Relation to Genera 47 



The Specificity of the Blood in Zoological Differentiation as Shown by the Phenomena of 



Coagulation 47 



The Leucocytes of the Blood in Relation to Genera 48 



The Proportion of Corpuscles to Serum in Relation to Genera 50 



The Blood Platelets in Relation to Genera 51 



The Form of the Erythrocytes in Relation to Genera 51 



The Number of Erythrocytes in Relation to Genera 52 



Table 20. The Number of Erythrocytes per Cubic Millimeter in Relation to Genera 53 



The Size of the Erythrocytes in Relation to Genera 54 



Table 21. The Sizes of the Erythrocytes in Different Genera according to the Measurements 



of Gulliver, Wormley, Treadwell, Formad, Welcker, and Malassez 55 



Gulliver's Micrometry of the Red Blood Corpuscles (Plate A) 58-59 



Certain Properties of the Erythrocyte in Relation to Genera 59 



The Percentages of Hemoglobin in the Dry Erythrocytes in Relation to Genera 60 



The Percentage of Hemoglobin in the Moist Erythrocytes in Relation to Genera 61 



The Percentage of Hemoglobin in the Whole Blood in Relation to Genera 61 



General Consideration of the Zoological Specificities of the Blood 63 



CHAPTER III. HEMOGLOBIN; ITS GENERAL CHEMICAL AND PHYSICAL CHARACTERS, AND ITS SPECIFICI- 

 TIES 67-82 



Constituents and Relations to the Other Constituents of the Erythrocytes 67 



The Elementary Composition of Hemoglobin 70 



The Molecular Formula and Weight of Hemoglobin 74 



The Solubility of Hemoglobin _ 75 



The Quantity of Water of Crystallization 76 



The Extinction Coefficients and Quotients 77 



The Differences in the Decomposability of the Hemoglobin of Different Species. 80 



Is the Oxyhemoglobin of the Blood of any Individual a Single Substance.? 82 



CHAPTER IV. THE PREPARATION AND STUDY OF HEMOGLOBIN CRYSTALS PREVIOUS TO THE INVESTI- 

 GATIONS OF PREYER 83-92 



