QUESTIONS FORMING A COMPLKTK IN DUX. 



LESSON LXIX. 

 Stars, why does their twinkling 



foretell had weather 485 



Steam, why dons it issue from the 



spout of a kettle 750 



Storms, what is the cause of ... 676 

 Storms, why do the mot vu.lent 



occur in and near the tropics ... 677 

 Straw, why is it frequently used 



for manure 1264 



" Sucker, 1 ' why does it raise a stone 8fiO 



Sugar, what is it 1197 



Sugar-cane, where is it cultivated... 1226 

 Sun, what is its distance from the 



earth 452 



Sun, what is the ... 455 



Sun, from what does its luminosity 



arise 456 



Sun and moon, why do they appear 



smaller when near the meridian, 



than when near the horizon ... 525 

 Sun, why do we see it before sun- 

 rise, and after sunset 482 



Sun, what is the magnitude of the 767 

 Suppers, why do they cause 



dreams 1021 



Swallows, why may wet weather 



be expected when they fly low 1104 

 Syringe, why does pressing in the 



handle force out a jet of water... 856 

 Syringe, why will not the water 



run out, unless the handle is 



pressed in 857 



LESSON LXX. 



Syringe, why will the water leak 

 out, but not run ... 858 



Syringe, why cannot the handle 

 be pressed in, if a finger is kept 

 on the orifice 8-59 



Tannin, what is it 1257 



Taste, why do we 996 



Taste, why are some substances 

 sweet, others sour, <fec 997 



Taste, why is it most powerful af- 

 ter substances have been a little 

 while in the mouth 998 



Taste, why if we put out the tongue 

 and touch it wiih a nub of sugar, 

 shall we perceive no tastn ... 999 



Taste, why when we draw in the 

 tongue do we then perceive the 

 taste of the sugnr 1000 



Taste, through what nerves are 

 we. made sensible of the con- 

 tact of sugar with the tip of the 

 tongue 1001 



Taste, why do connoisseurs of 

 wines hold wine in their mouths 

 a few seconds when 'judging of it 1002 



Taste, why do they also pass the 

 fumes of the wine through their 

 nostrils ... 1003 



Tea-pot, why does a bright metal 

 one produce better tea than a 

 black earthenware ... .. ... 200 



LESSON LXX I. 



Ten-pot, if the earthenware one 

 were, set hy the. fire, why would 

 it then make the best tea ... Sfll 



Tun, what is it 1192 



Tea. win-re is it cultivated 1225 



Tears, what is the cause of 877 



Temperature, why do some arti- 

 cles feel colder than others ... 138 

 Temperature, why does it feel 

 warmer alter a frost has set 



in 163 



Tendons, what are they ... ... 939 



Tendons, why are they used to 



attnch the muscles to the bones 940 

 Tenerinv, wViat are the botanical 

 regions of the Peak of ... ... 1241 



Thaumatrope, why do the figures 

 on appear to dance ... ... 869 



Thaw, why is it colder when a 



thaw takes place 164 



Thermometer, whfit is the 709 



Thermometer, wiry does it indicate 



degrees of heat 710 



Thermometer, why are there Reau- 

 mur's and Fahrenheit's ... ... 711 



Thermometer and barometer, what 



is the difference 712 



Thermometer, in what season of 

 the year does it vary most ... 715 



Thunder, what is it 614 



Thunder-peal, why is it sometimes 

 loud and continuous ... ... 616 



LESSON LXXII. 



Thunder-peal, why it sometimes 

 broken and unequal 617 



Thunder-peal, why is it sometimes 

 a low. grumbling noise 618 



Thunder-peal, why does it some- 

 times follow immediately after 

 the flash of lightning 620 



Thunder, through what distance 

 will the soundlravel 621 



Thunderbolt, what is a 628 



Tinder-box, the history of a ... 340 



Toasting-fork, why has it a wood- 

 en handle 124 



Tops, why do they stand erect 

 while they spin, bnt fall when 

 they stop 814 



Tops, why do they " sleep" ... 816 



Tops, why do they cease to 

 spin 817 



Touch, in what part of the body is 

 the sense of most perfect ... 1005 



Toxicologists, what are they ... 61 



Trap and ball, why is the ball pro- 

 pelled upward, when the trig- 

 ger is struck 866 



Trees, what arc the estimated nges 

 of 1214 



Trees, what are the northern lim- 

 it* of 1237 



Trees, why are they cuvt red with 

 bark ... ,.. ., .,. 1270 



