qUKSTIONS FORMING A COMPLETK INDKX. 



LESSON XXV. 



Electricity, what is the effect when 

 a current of electricity meets 



with an insulator 577 



Electric sparks, what is the cause 

 of 578 



E'ectricity, why does lightning at- 

 tend it ... ... 584 



Electricity, why does it affect the 

 phapes of clouds 613 



Electric storms, why are they 

 more frequent in hot than in 

 cold weather 624 



Electric storms, why do they fre- 

 quently occur after dry weather 625 



Electric storms, why do they puri- 

 fy the air 629 



Electricity, what is Voltaic ... 636 



Electrical attraction, what is it ... 778 



Elementary body, what is meant 

 by 19 



Element, what is the most abun- 

 dant in nature 756 



Elephant, why has it a short un- 

 bending neck 1076 



Elephant, why has it a trunk ... 1077 



Elephants' hind legs, why do they 

 bend forward 1078 



Etna, what are the botanical re- 

 gions of Mount 1240 



Endogenous sterna, what are they 1280 



LESSON XXVI. 

 Endogenous stems, why do they 



abound in tropical climates ... 1281 

 Endogenous stems, why have they 



no bark 1282 



Endogenous stems, why do they 



grow to a great height ... ... 1283 



Exogenous stems, what are they... 1279 

 Exercise, why does it promote 



health 1016 



Exercise, why does it make us feel 



warm ... 839 



Explosions of gas, what is tho best 



method of preventing 65 



Eye-balls, why are they white ... 911 

 Eye-balls, why do they sometimes 



become blood-shot 912 



Eyes, why are they placed in the 



sockets of the skull 929 



Eyes, why are we able to move 



them 965 



Eye, why does the pupil look 



black 968 



Eye, why is the pupil larger some- 

 times than at others 969 



Eyes, why have we two 970 



Eyes, why, having two, do we see 



singly 971 



Eyes, why are they provided with 



eyelids 972 



Eye-lids, why are they fringed 



with eye-lashes 973 



Eyes, whence are their humours 



Je~ed ... .. 976 



LESSON XXVII. 



Eyes, why do we feel inconveni- 

 enced by sudden light 978 



Eyoe, why if we look upon a bright 

 object and turn away, are we 

 unable to see 979 



Eyes, why are we able to see bet- 

 ter after a little while 980 



Eyes, why do cats, bate, owls, &c., 

 see in the dark 981 



Eels, why are their eyes covered 

 with a transparent horny coat ... 1 130 



Falling, what is the cause of bod- 

 ies 774 



Fanning the face, why does it make 

 us feel cooler 172 



Fata morgana, what is the cause 

 of 527 



Fatigue, why do we feel 1017 



Feather, why does it fall to tho 

 earth more gradually than a shil- 

 ling 79 



Features, why do we preserve the 

 same through life 90 



Feel, why do we 100 



Feeling, why is it impaired when 

 the hands are cold 100 



Feeling, why do the fingers prick 

 and sting when they again be- 

 come warm 100 



LESSON XXVIil. 



Feeling, why do persons whos 

 legs or arms IIHVH been ampu- 

 tated, for some time continue to 

 feel the part that has been re- 

 moved 1008 



Fibrin, what is it 899 



Fingers, why can we raise them ... 943 



Fingers, why can we draw them 

 back after they have been raised 944 



Fire, why does it burn more bright- 

 ly when blown by a bellowa ... 27 



Fire, what is it : ' 82 



Fire, what are its properties ... 83 



Fire, what elements take part in its 

 maintenance ... ... ... 84 



Fire, how does its combustion be- 

 gin 85 



Fire-screens, how do they contrib- 

 ute to keep rooms cool 217 



Ftre, why is it sometimes put out 

 by blowing it when it is low ... 262 



Fire, why does poking it cause it to 

 burn more brightly ... ... 287 



Fires, why do " blowrs" improve 

 the draft of air 288 



Fire, why does it sometimes appear 

 red, and without flame ... ... 283 



Fire, what effect has it upon air ... 284 



Fires, why do charcoal and coke 

 burn without flame ... ... 29'C 



Fires, why are charcoal and coke 

 difficult to light 293 



Fires, a new plan of kindling .. 2B-* 



