QUESTIONS FORMING A COMPLETE INDEX. 



XXi 



LESSON LVIL 



Plants, why dp they grow 1154 



Plants, why if we break the stein 

 of a hyacinth do we see a glu- 

 tinous fluid <;xude 1155 



Plants, why if we split the petal of 

 n tulip do we see cells containing 

 ditf'-ront colouring matters ... 1156 



Plants, why if we break a pea-shell 

 across do we find a transparent 

 membrane 1157 



Plants, why if we cut through H 

 cabbage-stump do we find a tough 

 coating enveloping a cellular sub- 

 stance 1158 



Plants, why are their seeds formed 

 within the corollas of flowers ... 1168 



Plants, why does the flower of the 

 poppy turn down during the 

 early formation of seed 1169 



Plants, why have those of the pea- 

 tribe a folding blossom 1170 



Plants, why are leal-buds enclosed 

 in scales which fall off as the 

 leaves open 1171 



Plants, what is meant by " t-ppcies" 

 of 1209 



Plants, what is meant by " genus" 

 of 1210 



Plants, progressive discovery of 

 new species 1211 



Plants, what are the three great 

 classes of 1212 



LESSON LV1II. 



Plants, what are the characteristics 

 of exogenous ... 1213 



Plants, what are the "'ft.'acteristics 

 of cryptogamug 1216 



Plants, what are the effects of di- 

 verse climates upon 1242 



Plants, what are the effects of alti- 

 tude upon mountains 1243 



Plants, what agencies influence 

 their geographical distribution ... 1250 



Plants, what are the chief facts 

 connected with the distribution 

 of by man 1251 



Plants, why are herbaceous less 

 solid than woody 1265 



Plants, why are the stalks of herba- 

 ceous generally cylindrical ... 1266 



Plants, what are the stomata of ... 1267 



Plants, why are their stomata gen- 

 erally on the underside of their 

 leaves 1268 



P'.ants, why have they pith in their 

 centres 1269 



Porter, why does bottled produce 

 large volumes of froth 801 



Pulse, why do we feel it beat ... 900 



Quadrupeds, geographical distri- 

 bution of 1331 



Quicksilver, why does it reflect 

 light from mirrors 513 



LESSON LIX. 

 Radiation, why does scratching a 



bright metal surface increase~its 



powers of 199 



Radiation of heat, what benefits 



arise from it 415 



Radiation of light, what is it ... 503 

 Radiation, do all bodies radiate 



light 504 



Rain, what is it 416 



Rain, does it ever occur without 



clouds 417 



Rain-drops, why are they some- 

 times large, and at other times 



small 418 



Rains, at what seasons are they 



most prevalent 419 



Rainy days, in what months of the 



year are they most frequent ... 420 

 Rainy days, why are there more 



from September to March ... 421 

 Rain, in what part of the world 



does the greatest quantity fall ... 422 

 ,Ritin, in what part of the world do 



the heaviest rains fall 423 



Rain, in what part of the world 



does the least rain fall 424 



Rainy days, how many are there in 



a year 425 



Rain, in what part of England does 



the greatest quantity fall 426 



Rains, why do the heaviest occur 



in hot countries 427 



LESSON LX. 



Rain, why does the greatest quan- 

 tity fall at the equator 428 



Rain, why are some parts of the 

 earth without it 429 



Rain, why does it purify the 

 air 433 



Rainy localities, why are mountain- 

 ous countries more rainy than 

 flat ones 434 



Rain, why does more fall by night 

 than by day 435 



Rain, why do bunches of dried sea- 

 weed indicate its coming ... ... 436 



Rain, why do weather-toys foretell 

 its coming 437 



Rain, the Capuchin toy; myste- 

 rious walk of a wooden horse ... 438 



Rain, why does ladies' hair drop 

 out of curl as rain approaches ... 438 



Rain, why is it said to be coming, 

 when the mountains are " put- 

 ting on their night-caps" 439 



Rainbow, what causes a 486 



Rainbow, why does it exhibit col- 

 ours ... 487 



Rainbows, why are there some- 

 times two 488 



Rainbows, why are the columns of 

 the secondary bow, arranged in 

 the reverse order of those of the 

 primary 48? 



