CONTENTS. 



PAGE. 



Introduction . 449-450 



History of earliest lymphatics in chick embryos 451 



Method 453 



Lymphatics of posterior lymph-heart region in chicks of 5 to days 454 



Lymphatics of posterior lymph-heart region in chicks of 4 to 5 days 460 



Operations on chick embryos 465 



Method of operation 466 



Operation 1. Removal of posterior lymph-heart region 467 



Operation 2. Removal of anterior point of origin for superficial lymphatics . 469 



Operation 3. Isolation of leg and pelvis 471 



Operation 4. Isolation of anterior part of leg and pelvis 475 



Summary of results obtained from operations on chick embryos 478 



General conclusions 479 



Bibliography 481 



Description of plates 482 



448 



