: e a 



PLATE 41. JTNIPERUS CALIFORNICA. Tangential section through the spring 

 wood showing the character of the low medullary rays. X 64.8 



PLATE 42. ABIES NOBILIS. Transverse section showing the occurrence of resin 

 canals and the distribution of scattering resin cells on the outer face of the 

 summer wood. X 39.2 



