VERTEBRATA. 103 



14. Does man have any balancing organs? 



15. Are dogs, cats and animals in general ever " right- 



handed " ? What is the significance of right-hand- 

 edness in man? 



16. How does the relative size of the face-bones and the 



brain-case (cranium) compare in man and any 

 lower vertebrate ? Why ? 



17. Is man the only animal that can converse ? 



18. How does the upright position of man affect, — 

 (a) the use of the arms ; 



(6) the carrying of the head ; 



(c) the form of the body (i.e. whether it is " com- 

 pressed " or " flattened ") ? 



19. To appreciate the hands as organs of prehension try 



to get along without them for a time, as other 

 animals always do, — during lunch, for instance. 



20. What would be the effect of hands without thumbs ? 



(Try in various ways to use your hands without 

 using your thumbs.) 



21. What traces of an invertebrate exoskeleton are still 



present in man ? 



22. Is there anything about the life history of man to 



suggest the metamorphosis of insects ? 



23. Does the moulting of the arthropods find any counter- 



part in man? 



24. Is there any trace of the somite plan of structure in 



man ? 



25. Can you think of any modification of "plans of 



structure " which might in time develop an animal 

 superior to man ? 



26. Are "protective colorings," so often noticed among 



lower animals, at all characteristic of man ? Why ? 



27. How can we explain the presence in man of such a 



