

QUESTIONS FOBMING A. COMPLETE INDEX. 



LESSON IX. 



Birds, why have those with long 

 legs short tails ... 1052 



Birds, why have aquatic web- 

 feet .- 1059 



Birds why have those that swim 

 and dive short legs ... ... 1060 



Birds, why have some deep rough 

 notches on the under surfaces of 

 their feet ... .., 1061 



Birds, why have they gizzards ... 1072 



jiinlsofprey why have they no 

 gizzards 1084 



Birds, why may wet and thunder 

 be expected when they cease to 

 sing .. ... ' 1121 



Birds of passage, why, if they 

 arrive early, may severe weather 

 be expected 1121 



Birds geological distribution of... 1326 



Jirds, tameness of in unfrequented 

 countries ... ... 1327 



Birds, why are birds of song not 

 also remarkable as birds of 



Bud^w^fat are the" velocities of 

 their flights ... 1329 



Birds, what is the cause of their 

 migrations 1330 



Blaci, why should parts of kettles 

 an<! saucepans be allowed to re- 

 main 204 



Blood, in what proportions are the 

 gases found in it... 39 



LESSOX X. 



Blood, -vhat is venous 41 



Blood, what is arterial 42 



Blood, what is the constitution of 



the 899 



Blood, what quantity does the 



human body contain 920 



Blood, how frequently does the 



whole quantity pass through the 



system 922 



Blowing upon tea, why does it cool 



it 174 



Bow. why does it propel the 



arrow 847 



Bow and arrow, what line does the 



arrow describe 8i8 



Bow and arrow, what forces tend 



to arrest the arrow 849 



Bow and arrow, why are there 



feathers at the ends of arrows ... 850 

 Bones, how many are there in the 



human body 923 



BOI..-S, of what substances are they 



composed 924 



Bonos, what are the uses of the ... 925 

 Bones, why are those of the back 



hollowed out 927 



Bones, why are those of the skull 



arched 930 



Bones, why are those of the skull 



divided by small sutures ... 931 

 Bones, why are they hollow ... 934 



LESSON XII. 

 Bones, why are those of the arms 



and legs formed into long shafts 935 

 Bones, why are those of the feet 



and hands numerous and small 936 



Botanical geography 1208 



Brain, why is it placed within the 



skull 926 



Bread-fruit trees, where are they 



natives of 1223 



Breathing, is it a kind of combus- 

 tion 17 



Breaths, have people ever been 



poisoned by their own 21 



Breezes, why are summer said to 



be cool 170 



Breezes, what is the cause of sea 



and land ... 235 



Bubbles, why do they ascend in 



the air 236 



Bubbles, why do they fall, after 



having ascended 237 



Bubbles, why do they display 



rainbow colours 499 



Bubbles, why are they round ... 825 

 Bubbles, why are they elongated 



when being blown 826 



Bubbles, why do they close, and 



become perfect spheres when 



shaken from the pipe 827 



Bubbles, why do they change 



their colours in the sunshine ... 828 

 Bubbles, why do they burst ... 829 



LESSON XI. 



Burning or supporting combus- 

 tion, what is the difference ... 45 

 Burning-glasses, why do they 



appear to set fire to substances S; 

 Butterflies, why do they lay their 



upon cabbage-leaves ... 109& 



Butterflies' eggs, why do they lie 

 dormant in the winter 1288 



Butterflies, why do they fly by 

 day 1298 



Calms, why do they prevail at the 



equator 671 



Caloric, what is it 72 



Caloric, what is the source of it... 73 

 Caloric, what are the effects of it 74 

 Caloric, why is it called a repulsive 



agent 75 



Caloric, how may it be excited to 



develope heat 79 



Caloric, is there any in ice, snow, 



water, marble, &c 89 



Caloric, how do we measure the 



quantity of in any substance ... 329 

 Caloric, how does it travel ... 332 

 Caloric, how do we know that it is 



caloric which fuses metals . . . 334 

 Calves and lambs, why have they 



no horns 1069 



Camel, why has its stomach a 



number of distinct bags 1065 



Candles, why do tallow require 



snuffing 264 



