250 



EXPEItlMEJSTS WITE PLANTS 



is found in the Wandering Jew, Grasses and some 

 other plants. Examine some gi'owing Grass or G-rain: 

 notice how tender and succulent the joints are; also 

 how much sugar they contain, as shown by the taste. 

 Cut off a stem half an inch above a joint. Three or 

 four inches below the joint make another cut and place 

 the piece in a moist atmosphere with the base in water 

 or wet sand. The growth at the joint will soon mani- 

 fest itself by contrast with the sheathing base of the 

 leaf which surrounds it and which grows very little 



or not at all. 



In order to get a 

 clear idea of what 

 goes on in the forma- 

 tive region, let us 

 study a large bud, 

 such as a head of 

 Cabbage or Brussels 

 Sprouts (Fig. 144) . 

 The end of the stem 

 is seen to be conical; 

 at its extreme tip are 

 small outgi'owths (eas- 

 ily seen with a hand- 

 lens) ; these are the 

 youngest leaves. 

 Next to these are 



144. Bud of Brussels Sprouts cut lengthwise: {/) t i . i i i 



fibrous bundles, {hi) the crumpled leaf -blade. Slightly OidCr OUOS, 



