156 ELEMENTS OF MAMMALIAN ANATOMY. 
4. How do you distinguish a lymph gland from other glands? 
5. What causes the lymph to flow in one direction only? 
6. What is meant by afferent and efferent lymphatics? 
7. Which kind of blood-corpuscles are found within the lymph- 
vessels? 
8. From what regions does the thoracic duct receive the lymph? 
9. What glands receive the lymph from the thoracic limb? 
10. What glands receive the lymph from the pelvic limb? 
11. Describe location of spleen, thyroid and thymus glands, and 
suprarenal capsules by naming the organs with which they are in contact. 
12. Draw a cross-section of the spleen and label all features visible. 
13. Draw a cross-section of the suprarenal body and label parts. 
14. Tell what you know of the functions of the ductless glands. 
15. What is a gland? 
