H(i\V IHi; I'LANT LIVES 



129 



gns will be seon to ri«e and collect in the tube. If a sufTieient 

 qiiniitiiy of tliis pas coulil be qiiii-kiy collected, on testing it 

 with a lighted tapt-r the tlame would be seen to quicken per- 



^• 



W 



f 'f. 42 Ot>*nlm{ of 

 k bad of {war 



Fie. 4.1. The marking of tho ktcm aod 

 the •preadlns apart of the marki. 



ceptii>!y, indioatinjf more oxypen than is contained in the air 

 In this caao tho carbon dioxid used is in solution in the water. 

 The Eloden is rnniinon in still ponds. 



'201(1. On the subject of tenipernture and plant life, compare 

 Bailey, "The Sunivnl of tho Unlike," pp. 44-48, Chapters xvji. 

 and xix.; and Chapter xiii. of Oaye's "Great World's Farm." 



202<i. Compare Arthur and MacDougal. " Living Plants ana 

 their Properties," pp. 8:>-98, for ■ i .....;.... ..f .v.„ influence of 



eold in injurinf; plants. 



203a. To test for starch in a poiuio tuoer or other atoragv 



I 



