Th. Lewis, Tlie Structure and Fnnctions of the ha3molymph Glands etc. 55 



Fig. 7. General dissection of hïenial glands in a rat, showing the vascular and 

 nervous supply. On the right of the figure, near the anterior end of the 

 kidney, is the "renal group" of glands, 3 glands are present. On the 

 left of the aorta the spleen and stomach are thrown over to expose the 

 omentum sHnging them, and 4 glands contained in it. ao aorta; c cae- 

 cum; k kidney; r.g renal gland; s.c suprarenal; s.g splenic gland; 

 sp spleen; st stomach; ur ureter; v.c vena cava. In front of the aorta 

 and vena cava lies the aortic nerve plexus and its branches. The splenic 

 and renal vessels and branches are in view. Small twigs run to the 

 glands. (Reduced to -/g.) 



Fig. 8. Vertical section of ha;mal gland of rat, stained heemalum and eosin (as 

 seen under a magnification of 105 diameters). The gland is cut at right 

 angles to the numerous strands of lymphoid tissue issuing from the 

 general mass. The section illustrates the general arrangement of the 

 lymphoid tissue and sinuses, which are filled with blood and phagocytes. 

 Masses of brown pigment occur in the adenoid tissue. (Reduced to ^/g.) 



Fig. 9. Small portion of last (as seen under a magnification of 1000 diameters). 

 e.c.c endothelium cell lining capillary;^) l.h.c large hyaline cell; ph^ Pha- 

 gocyte containing two spherical masses of haemoglobin; "pli^ Same as ph^ 

 with erythrocyte also; ])]i^ Phagocyte full of pigment. 



Fig. 10. Section of head kidney of Cyclopterus lumpus stained saffranin and light 

 green ^) (as seen under a magnification of 330 diameters). 



Fig. 11. Series of sketches of phagocytes, illustrating the process of blood de- 

 struction (as seen under a magnification of 2000 diameters). Stained 

 hasmalum and eosin. a) Large hyaline cell; if) similar cell dividing; 



c) a cell containing an ingested blood cell which lies in a vacuole; 



d) phagocyte containing a number of unchanged red cells (this was taken 

 from a section stained in bulk in Ehrlich and eosin; e) and f) phago- 

 cytes containing red cells and globules of pigment of various size; 

 g) phagocyte containing spherical masses of deeply stained haemoglobin; 

 h) another containing a small mass of pigment and in the top left hand 

 corner a yellow pigment mass tinged red; i) phagocyte containig two 

 nuclei, a mass of pigment tinged with red. In addition a body with red 

 zone in centre and yellow zone surrounding it; black specks appear bet- 

 ween the two layers; j) phagocyte containing two red cells, a mass of 

 haemoglobin nnd a leucocyte, also pigment; Ar) cell containing large mass 

 of yellow pigment, and the remains of a leucocyte. Beneath the nucleus 

 is one of the bodies seen in i); I) cell containing pigment; nucleus not 

 apparent. (P^educed to ^j^-) 



Fig. 12. Section of gland of rat, arteries injected (as seen under a magnification 

 of 105 diameters). The right half of the figure shows the sinus full of 

 injection, the left half is dotted blue to represent lymphoid tissue. 

 c capillary; a^ artery in strand of lymphoid tissue; a^ artery entering 

 hilum; /fat with blood vessels injected. (Reduced to ^jn.) 



^) These cells should resemble those lining the sinus, much more closely. 

 -) The saffranin does not show well in this sketch, as the colour was washed 

 over pencil. 



