AUTHOR’S ABSTRACT OF THIS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, JUNE 2 
THE HISTOLOGY OF THE BLOOD AND THE RED 
BONE-MARROW OF THE LEOPARD FROG, 
RANA PIPIENS 
H. E. JORDAN 
Laboratory of Histology and Embryology, University of Virginia 
TWO PLATES (SEVENTY-THREE FIGURES) 
CONTENTS 
esa MOND oe tips 3 (sone eckcnuiin boos for hore ie a anor bale ashes Ge Be Rene Es eae aes ae 437 
Cer ee TGLOOOR Nest We AEs lacie oa aodlecs Rue RE Be A 4 ete tectee 438 
PRRs aN ROTM ae pac cLace's urs ole ace Seca eee eke ee TR Rte CL an 439 
ai Lhe histology ‘of the circulating blood)! )..0)0...2.. 00/0850. Rts 439 
Pee ELE EM URTOP VES. 444). tare) Sunfss ys dyatowe oa Pacheco aos Bete 439 
PAL VATU CV LES 8 \02/5 tae by Abbe e. q.es.s de Ss cape Be oe 439 
ae eae POsinopnilic: leucacytes.% zc ss<. =. + 445,50 «8.0 WU ROS hs ee 441 
4- ihe. basophilic leucocytes. //2 6. 6o7 oA Le ie 442 
cpne MCULFOpHilic IEUCOGYLES... 1. 5. « Leis. satan unten ed dase eon e. 442 
Gop tiie. ChmOMmOCVLER sn. poeknte i auars'sy 5s eae rene SSO Hetrecih kee 443 
beeitne histology of the red bone-marrow... ..... 2 ..,02.ccsa cade deen une de. 445 
1, The development of the erythrocytes......................4 Petes oes 446 
2: The development of the lymphocytes. :... 2. 29.0.0. 2h Jcci aonb wee 447 
3. The development of the eosiniplfilic leucocytes.................0. 448 
4, The development of the basophilic leucocytes.................... 449 
5. The development of the neutrophilic leucocytes................... 450 
®,, he development of the thrombocytes..;. 0.2... 2 seat. sss tee 451 
7. The development of the plasma-cells and giant-cells............... 451 
Pireminuiand Conclusions 3a <2 sqia ceo pili ee a ere als Ae eae oe 452 
SSUNLETIAOTAS AAR Ve ee eM SEER Par RAR dete cent eae eee eRe S Hicecrs och ORs Aone ee ee 471 
INTRODUCTION 
This investigation was begun with the study of the bone- 
marrow. Special interest in this tissue was first aroused through 
a previous investigation” of the giant-cells of the red bone- 
marrow of certain mammals. The primary object of this work 
concerns the identification of the amphibian homologue of the 
hemogenic giant-cell of mammals, the so-called megakaryocyte. 
437 
