No. 454] ANATOAfV OF THE CONIFERALES. 695 



lated and scattering, thereby c\ 

 Picea and Pinus. In iMnx ikri 

 tive form of (Hstribution is ex]) 

 gential zone essentially siniihu 

 In both Pseudotsuga and Larix 

 cells from all parts of the struct 

 of the summer wood. In Pic( 

 there is a complete obliteration 

 enter into the structure oi the n 

 correlated with a higher t \ pe ot 

 In the genus Pinus, as aln 

 reaches the highest degree of 

 shows little if any tendency to t 

 are expressed in the formation 

 entirely replaced the isolated r 

 found in that genus. 



If, then, uc ask N\hat \alut 

 nomic purposes we find them V 

 It has already appeared that 1 

 cysts is of well defined value to 

 same rule is also applicable to 

 species of Abies. In the highe 

 tsuga, Larix, Picea and Pinus, 

 passages in the wood and in th 

 to separate these genera fiom a 

 may occur, but it differentiati 



feature of great \alue. More 

 thelium of Pinus at once scp. 

 three, which are invariably cha 

 lium. Such generic diheienti 

 the occurrence of th\ loses 

 Pinus, where they are alwavs t 

 present. They are therelore < 

 other features previousl) desc i 

 ever, their presence in either 

 where the\ are generall) thick 

 as to give them no definite \ah 

 specific diagnoses such struct u 



