PLATE LXXIV. 



Fig. 49. Cross section of wood: 1,1, limits of a year's growth; z, 

 medullary ray; w, tracheal tube; k, fiber tracheids. X 85. 



Fig. 50. Longitudinal section of wood: z, medullary rays; w, fiber 

 tracheids. x 85. 



Fig. 51. Cross section of wood: z, medullary rays; w, tracheal tube; 

 k, fiber tracheids; v, wood parenchyma. X 155. 



Fig. 52. Longitudinal section of wood. Lettering same as in fig. 51. 

 X 155. 



