116 HISTOLOGICAL BOTANY. 



as the resin-containing lacunae in the leaves and stems of 

 Pines. 



_, I Those containing air. 



KINDS OF INTERCELLULAR SPACES I Those contaillillg certain 

 ACCOEDING TO THEIE CONTENTS j pe(mliar s „ bstanceB . 



SUMMARY. 

 Intercellular spaces are lacunae between the cells of a tissue. 



