Suggestions and Course of Study 139 



what climatic conditions would each of these leaves 

 naturally prevail? 



What advantages result from having lungs inside 

 the body and gills outside? 



VIII. On the Rise of Liquids, (a) Take a strip of 

 blotting paper or filter-paper, and a strip (same size) 

 of ordinary writing paper; put one end of each into 

 water; notice the difference. How far above the 

 surface of the water is the strip of filter-paper wet? 

 Explain the difference. (6) Take two wide-mouthed 

 bottles of equal size and fill both with water. Place 

 the strip of filter-paper into one so as to project two 

 or three inches; cork both bottles gently. After a 

 day or two which bottle contains most water? Ex- 

 plain the difference, (c) Repeat the experiment after 

 filling both bottles as before; but this time place the 

 wet sponge on the cork next to the strip of filter-paper. 

 After the same lapse of time how do the results agree 

 with the previous ones ? Account for it. How would 

 a moist and a dry atmosphere respectively affect the 

 disappearance of water in the two bottles? (d) Fill 

 the two bottles again; place a strip of filter-paper 

 as before in each bottle, and cork both lightly. Put 

 one of the bottles into a tumbler containing half an 

 inch of water. Invert another tumbler over the top. 

 Leave the other exposed to the dry air of the room. 

 Which loses most water? Explain the difference. 

 How would a moist climate affect the amount of 

 water transpired from the leaves of plants? (e) Fill 

 a tumbler with water; take a card board and 

 make a round opening in the center large enough 

 to allow the small end of a hen's egg to reach the 

 water but not pass clear through the opening. Re- 

 move the shell very carefully from the small end of 

 the egg, care being taken not to tear the thin egg- 

 membrane underneath; an area a quarter inch square 

 will suffice. In the opposite end of the egg, make a 



