Eli 



QUESTIONS FOEMING A COMPLETE INDEX. 



LESSON XXI. 



Dew, why is there none formed on 

 windy nights 352 



Dew, why are valleys and low 

 places chiefly subject to it ... 353 



Dew, what bodies receive little of 

 it 355 



Dew, what bodies receive most of 

 it 854 



Dew, at what period of the night 

 is it chiefly formed 356 



Dew, why is it chiefly formed at 

 that period 357 



Dew, in what parts of the world is 

 the greatest quantity formed ... 358 



Dew, in what parts of the world is 

 the least quantity formed ... 359 



Dew, why is it seldom formed at sea 3(50 



Dew, why is it, when heavy, re- 

 garded as a precursor of rain ... 361 



Dew, what is honey-dew 364 



Dew, why does it lie on the ex- 

 posed sides of screens of plants 401 



Dew, why does it rest upon the 

 upper surfaces of leaves 402 



Dews, why are cultivated lands 

 more subject to them than those 

 that are uncultivated 403 



LESSON XXII. 



Dew, why does the gravel- walk re- 

 ceive less dew than the grass ... 



Dew, why does little of it form at 

 the base of hedges, walls, and 

 trees 



Dews, why do morning dews and 

 mists usually come together ... 



Dew, what effect have winds 

 upon its formation 



Dew, why does it foi-m in round 

 drops upon leaves 



Diamond, what causes the bril- 

 liant colours of the 



Digestion, why does food flow 

 more freely to the stomach dur- 

 ing 



Digestion, why does excess in 

 eating impair 



Digestion, what changes occur to 

 food in the stomach 



Digestion, what causes bilious at- 

 tacks ... 



Digestion, how is the nutritious 

 matter taken from that which is 

 innutritious 



Digestion, what becomes of the 

 nutrition when it enters into 

 the circulation 



Dish-covers, why should they 

 be plain in form, and have 

 bright surfaces 



Dogs,' geographical distribution 

 of 



Dream, why do we 



prowsiness, why is it felt in 

 crowded rooms 



1333 

 1020 



22 



LESSON XXIII. 



Ducks and geese, why do they 

 dash water over their backs on 

 the approach of rain 1105 



Ducks and geese, why have they 

 square-pointed bills 1044 



Dyes, vegetable, what are they .. 1259 



Ear, why is it spread out exter- 

 nally 



Ears, why do hairs grow across 

 them 



Ear-wig, why is it so called 



Ears, why is wax secreted in the 



Ears, why do singing noises occur 

 in the 



Ears, why do people become deaf 



Ears, why do people accustomed 

 to loud noises feel no inconve- 

 nience from them 



Ears of animals of prey, why do 

 they bend forward 



Ears of animals of flight, why do 

 they bend backward 



Earth, why is it warmer than air 

 during sunshine 



Earth, why is it colder than air 

 after sunset... 



987 

 988 



1063 



1034 



398 



399 



LESSON XXIV. 



Earth, how can man weigh the ... 784 

 Earth, what is the weight of the 788 

 Earth-worms, why have they no 



feet 1085 



Echoes, why do some occur 



immediately after the sounds ... 742 

 Echoes, why do some occur at a 

 considerable interval after the 



sound 748 



Echoes, why do some change the 



tone and quantity of sounds ... 744 

 Echoes, why are there sometimes 



several to one sound 745 



Echoes, are they caused only by 



distant objects 746 



Echoes, what are they 741 



Electricity, what is it 561 



Electricity, why is it so called ... 562 

 Electric fluid, why is it so called 566 

 Electrics, what substances are ... 567 

 Electricity, what is positive ... 568 

 Electricity, what is negative ... 569 

 Electricity, what is vitreous ... 570 

 Electricity, what is resinous ... 570 

 Electrical phenomena, what pro- 

 duces them 571 



Electricity, how does its equili- 

 brium become disturbed ... 672 

 Electricity, how does it seek to 



regain its equilibrium 573 



Electricity, what substances are 



conductors 574 



Electricity, what substances are 



non-conductors 579 



Electricity, what substances are 

 iusulat. i 575 



