22 HOUSE, GARDEN, AND FIELD 



to cover half an ineh. At length it turns sideways, 

 I lie vessels ol I lie mnli il, ;ind passes into the web of the 

 le;d, where it begins (o feed on the green cells. Soon 

 after this a small blister begins to show, and this first 

 catches the eye of the poring naturalist, who had hem 

 searching all the time for blisters, and never dreamt of 

 examining the midribs of the leaves. 



VI. A GENERAL KNOWLEDGE PAPER ON 

 COMMON THINGS FOR GROWN-UP 

 PEOPLE. 



1. How may the waxing moon he distinguished at a 

 glance from the waning moon ? 



2. How does a cat wink ? 



3. Why do the black keys of a piano run in twos and 

 threes ? 



4. Walking under some trees on a summer day, I find 

 a great number of bees lying helpless on the ground ; 

 some have lost their heads. What has happened ? 



5. Why does dust rise from the road with a light wind, 

 while the heaps of stones (of the same weight for a given 

 bulk) lie still ? 



6. What differences can you point out between the skin 

 of the palm and the back of the hand ? 



7. Draw from memory and in side- view the surface of 

 the mercury in a barometer-tube, and the surface of water 

 as seen in a tube of the same size. 



8. Why does the moon look bigger when near the 

 horizon ? Prove that her apparent diameter, as mea- 

 sured by instruments, must be less when she is near the 

 horizon than when she is high in the heaven. 



9. On a frosty morning, when the ground is thinly 

 covered with snow, I have remarked that the snow lies 

 lon-ei than elsewhere on a low bridge over a dry gully; 

 that it melts early on a low bridge over a stream; and 



