288 



In those plants bearing- trieliomes it was found that those growing in 

 the loam had the smallest number. 



An interesting fact was noted in connection with the development of 

 wood in the carnation. The loam here gave the greatest wood development 

 and the clay the least, while on the other hand the clay showed a heavy 

 baud of hard-bast. A decrease in the amount of woody tissue seems to 

 have been followed by an increase in the amount of liard-bast. In the 

 clay specimens where there is such a large amount of hard-bast, the wood 

 is merely represented by a few large vessels and a few wood cells. 



In conclusion, it may be said that as a result of the variation of soils, 

 there are more marked changes in the gross than in the minute structure. 

 The changes in gross structure are general for all the plants studied, while 

 the changes in the minute structures are more for specific than for gen- 

 eral cases. 



TABLE SH0WINC4 NUMBEK OF STOMATA PER SQUARE MM. 



*No count was made for the upper side, as it was impossible to remove the epidermis. 



