LIST OF ILLUSTRATIONS xxv 



FIGURE PAGE 



481. Reconstruction of a dog's adrenal 555 



482. Section of part of an accessory suprarenal (chromophil body), new- 

 born child 556 



483. From a section of the human thyroid gland .... 558 



484. Diagram of pharynx of human embryo showing the origins of the 



anlages of the thymus, thyroid and parathyroids (epithelial bodies) 560 

 485. From the border of a mass of aberrant thyroid tissue of man, occur- 

 ring in the region of the parathyroid glands .... 562 

 486. Human parathyroid tissue, moderately magnified . . . 564 

 487. A section through several lobules of the thymus of an infant . . 566 

 488. A thymic corpuscle from the thymus of an infant . . . 567 



489. Carotid gland of an ape 569 



490. From a section of the coccygeal gland of man .... 570 

 491. Median section through the anlages of the hypophysis cerebri of a 10 



mm. cat embryo 571 



492. Sagittal view of a wax reconstruction of the hypophysis cerebri of 



the adult cat 574 



493. Pars tuberalis, hypophysis of cat 576 



494. Pars infundibularis, hypophysis of cat ..... 576 



495. Pars distalis, hypophysis of cat 577 



496. Section of hypophysis cerebri of dog, showing portions of pars distalis 

 of anterior or buccal lobe, residual lumen, pars tuberalis (pars 

 intermedia), pars neuralis, and capsule ..... 578 

 497. Field from the center of a normal canine (puppy) pars anterior . 579 

 498. Semidiagrammatic representation of a median longitudinal section 



through the epiphysis of a 17 cm. sheep fetus .... 581 

 499. Cells from the pineal body of a 11 cm. sheep fetus . . . 582 

 500. Photomicrograph of a peripheral portion of the pineal body of a 21 

 cm. sheep fetus, showing several cysts and vascular trabeculae, 

 and an enormous number of intracellular melanic granules . 583 

 501. Photomicrograph of peripheral region of pineal body of a yearling 

 sheep, to show the character of the parenchyma, the neuroglia cells 



and fibers, and the interneuroglia cells 584 



502. Two neuroglia and three interneuroglia cells from the pineal body 



of a lamb 584 



503. Cells from pineal of yearling sheep . . . . . 585 



504. Section of pineal body of an old sheep, showing 'brain sand' (acer- 



vulus) in the parenchyma 586 



505. Human embryo 2 millimeters long 587 



506. Transection through the Graf Spee embryo shown in figure 505 . 588 

 507. Three successive stages in the process of closure of the medullary 

 (neural) groove to form the medullary (neural) canal and neural 

 (ganglionic) crests 588 



