1897] MYELOPTERIS TOPEKENSIS 21 
Another important feature of these canals is to be found in the 
fact that they are always devoid of contents. This appears to 
justify the view that whatever they may have contained origi- 
‘ nally was of a soluble nature and thus passed out of the body 
of the plant during the process of petrifaction. 
In all their principal structural aspects these canals bear a 
strong resemblance to those of Angiopteris evecta (they are of 
the same type), and it may also be pointed out that they are 
similar to those found in Rachiopteris Williamsoni which Seward 
has recently separated from Myeloxylon,” as also to those of 
Myeloxylon itself." 
Throughout the transverse section of the Topeka specimen 
there are numerous resinous or coaly masses of very variable 
size, but evidently originally contained in special channels or 
cells, which have become much disorganized, and the details of 
which cannot now be made out. In longitudinal section these 
7 masses are of indefinite length, but rather frequently septate. 
From these features it is possible to refer them to the residue of 
resin masses which the plant originally contained, and they are, 
therefore, directly comparable with the similar resin bodies 
found in recent plants, particularly those of Angiopteris evecta. — 
_ It is thus fairly certain that in the Topeka plant there were _ 
_ originally at least two, and possibly more, kinds of secretory _ 
organs, the one holding mucilage, the other resinous matter, fa 
and i in — Spe aiie our me is once more Pee ara 
