Contents 



Chapter Page 



Preface Ill 



1 General rkm\i!Ks and definitions 1 



Methods of study 1 



Terminology 8 



Magnification 14 



Arrangement of subject matter 15 



2 Circulating blood of the hatched 



CHICK EN 17 



Erythrocytes 17 



Normal mature ervthrocvtes 17 



Develoj»riiciital stages found in circidating 



blood 24 



Atypical and al)norinal erythrocytes 30 



Technic artifacts 33 



Thrombocytes 41 



Normal mature thrombocytes 42 



Deselopmental stages found in circulating 



blood 44 



Abnormal cells 45 



Technic artifacts 46 



nongranulak leukocytes 47 



Lymphocytes 50 



Normal mature lymphocytes 50 



Deyelopniental stages found in circulating 



blood 53 



Vbnormal hmphocytes 54 



Monocytes 65 



Normal mature monocytes 65 



De\ciopmental stages found in circidating 



blood 70 



Abnormal monocytes 72 



Technic artifacts 72 



granular leukocytes 73 



Heterophils 73 



Normal mature heterophils 73 



Developmental stages found in circidating 



blood 86 



Abnormal heterophils 87 



Technic artifacts 87 



Eosinophils 89 



Normal mature eosinophils 89 



Chapter Poge 



2 Circulating blood of the hatched 



CHICKEN — Continued 

 granular leukocytes — Continued 

 Eosinophi Is — Con t inued 



Deyelopniental stages found in circulating 

 blood 91 



Abnormal cells 91 



Technic artifacts 91 



Basophils 91 



Normal mature basophils 91 



Developmental stages found in circulating 

 blood 92 



Technic artifacts 92 



hemokoma and serum granules 93 



3 Circulating blood of the embryo 104 



Erythrocyte changes during incubation. . . . 104 

 Description of the cells 115 



Primary erythrocytes 115 



Later embryonic ery throcy te generations . 128 



Embryo thrombocytes 130 



Cells occasionalK found in circulating 



blood of the embryo 133 



4 Blood cells from hematopoietic organs 



of the embryo 141 



Embryo bone marrow 141 



Embryo spleen 155 



Blood changes at hatching 157 



Lymphocytogenesis in the thymus 167 



Eeather sheath cell 169 



5 Blood cells from bone MARHo^^ of the 



hatched chicken 181 



Erythrocytes and thrombocytes 181 



Granulocytes 193 



Plasma cells 197 



Osteoclasts 198 



Differential counts on bone marrow 198 



6 Blood cells of other avian species 202 



Description of cells 202 



Size of cells 211 



Cell counts, hemoglobin levels, and hemato- 

 crits 214 



Arneth counts 220 



V 



