XI. STEMS 



102. LOCATION OF GROWTH 

 Object. To find where young stems grow most rapidly. 



Apparatus. Young seedlings of bean, pea, squash, or any other 

 young shoots, a marking apparatus as shown in Figure 38. It is 

 cut out of pine and has 

 threads stretched across it 

 exactly one eighth of an 

 inch apart. 



Method. Wet the 

 threads of the marker 

 with India ink and touch 

 the young stem. This 



Will make a series of FIG. 38. Growth marker, 



lines or dots on the stem one eighth of an inch apart. 



After a day note whether the dots are the same distance 

 apart. Continue to make observations, until you know 

 where growth is most rapid. (See also Experiment 82.) 



Conclusion. State the result of this experiment. 



103. UPWARD GROWTH 



Object. To learn something of upward growth of 

 stems. 



Method. Plant a seedling in a flowerpot so that it pro- 

 jects through the drain hole. Then suspend it as in Figure 

 39. After a few days observe the position of the stems. 



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