OTHER GLANDS 201 



the internal secretions are less striking. As old age approaches, 

 these glands become less active. Great prominence has been 

 given experiments along the lines of postponing old age by treat- 

 ment of these glands. These experiments are supposed to affect 

 senescense, old age, and bring about rejuvenescence, youth and 

 vigor. Various methods of rejuvenation have been tried ; such 

 as, grafting glands of young monkeys on human beings or feeding 

 glandular extracts. All of these methods are still in the experi- 

 mental stage. Old age is the breaking down of many of the sys- 

 tems in the body, and it is extremely doubtful whether glandular 

 extracts will rejuvenate the entire body. To date, the persons 

 who received the grafted glands showed improvement for a short 

 time only. The grafted gland was, ultimately, absorbed by the 

 surrounding tissues. Some scientists attribute the temporary 

 youthful effects to the optimism and enthusiasm of the subject 

 rather than a definite physiological effect. The experiments seem 

 to have some effects, but they are too experimental to discuss as 



facts. 



Questions and Suggestions 



1. Name four diseases related to the thyroid activity. State the 

 amount of thyroid secretion in each disease. 



2. Discuss a diet deficiency affecting the thyroid glands. How has 

 the resulting disease been controlled ? 



3. Account for giantism and dwarfism by glandular activity. 



4. Discuss all the physiological activities involved in a dancing 

 dervish. 



5. Name two hormones used commercially. Give the use of each. 



6. Make out an outline of the ductless glands and fill in the following 

 headings as far as possible : (a) Name of gland, (6) Endocrine or 

 hormone, (c) Use to the body, (d) Disease resulting from over- 

 secretion, (c) Disease resulting from undersecretion. 



7. During a fire, the farmer who owned the house carried a cook 

 stove from the burning building. After the fire he found he could 

 not move the stove without help. It took three men to carry the 

 stove. How can you explain his unusual strength ? 



8. What effect does a large cheering section probably have on the 

 players of a football team? 



WH. FITZ. AD. BIO. — 14 



