DEJ 



'«Ti? 



i^From the Physiological Laboratory, Cardiff, December 20tli, 1901.) 



The Structure and Functions of the hsDmolymph Glands 



and Spleen. 



By 

 Thomas Lewis, B. Sc, 



University of Wales, 



(With Plates I, II.) 



Contents, 



page 



I. Introductory 2 



II. Historical 4 



III. Anatomy and naked eye ap- 

 pearances in Vertebrata . 8 



A) Mammalia 8 



1. Primates 8 



2. Ungulata 10 



3. Carnivora 12 



4. Rodentia 13 



Ö. Insectivora 15 



B) Aves 16 



C) Reptilia 16 



D) Amphibia 16 



E) Pisces 16 



IV. Distribution in Vertebrata . 17 



V. Methods 18 



Vf. Minute structure ...... 19 



1. Microscopic Anatomy of a 

 typical hfemal gland . . 19 



2. Differences in the histologi- 

 cal details between the 

 glands of different animals 25 



3. The'^Head Kidney" of Pisces 28 

 VII. Vascular supply of the Haemal 



glands of the rat ... 28 

 VIII. Nervous supply in the rat and 



dog 30 



32 



32 



37 



page 

 IX. Lymphatic supply .... 32 



X. An account of Phagocytosis in 



the haemolymph series of 

 organs . 



1 . The phenomena of Phagocy- 

 tosis 



2. Glands in which Phagocy- 

 tosis occurs 



3. Origin of Phagocytes . . 38 



4. Nature of the pigment found 



in the glands 40 



5. Relative degree of activity, 

 as regards Phagocytosis, of 

 the spleen and hœmal glands 



of the rat ...... 42 



XI. Function of the hœmolymph 



organs 43 



XII. Development 45 



XIII. On the structural inter-rela- 



tionships of the various 

 members of the hfemolyraph 

 series 46 



XIV. Summary of chief Conclusions 50 

 XV. Bibliography 52 



XVI. Explanation of plates ... 54 



luternationale Monatsschrift für Anat. u. Phys. XX. 



1 



