136 



THE GEOLOGICAL HISTORY OF PLANTS. 



relation, no doubt, to the equable climate of the period. 

 There is not much evidence that they grew with the Si- 

 gillariiB in the true coal-swamps, though some specimens 

 have been found in this association. It is more likely 

 that they were in the main inland and upland trees, and 



b'lii. t'-l. — '/'riifonncarpum ll'^'kiri. IViw- 

 s>'n, tV.'tii till.' t-i>;il-tiifaMii-i's 111' (':ijii' 

 I'.rrl.in. i ■|,.luil.l\ the iVuil .il a 'I':i\- 

 iiH' Ir,','. V, I'.nik.'ii ?,ji.rini,n rn:i-ni 

 floil twi.'c n.'ilui-nl si/r. v.. Sr.'l imti iikiv n i lir, I : ,j, llir lr,,|;i; /', Ihr li'i;^ 

 nirn ; ,, llir ini,-lrii^; ./. I li,' nil I .r\ o. r, I 'm I mn hT I !ir Mil fiuT ul I ho 

 iiilur r.-al 111. 11-,. hl^lll^ inii-jinlii',!. 



that in consequence they are mostly known to us by 

 drifted trunks borne by river inundations into the seas 

 and estuaries. 



A remarkable fact in connection with them, and show- 

 ing also the manner in which the most durable vegetable 

 structures may perish by decay, is that, like the Cordaites, 

 they had large piths with transverse partitions, a struct- 



