The Structure of Pachytheca. II. 
BY 
C. A. BARBER, B.A., 
Scholar of Christ's College , Cambridge, and University Demonstrator of Botany. 
With Plate IX. 
I N a former number of this Journal 1 I made a study of the 
structure of Pachytheca as exhibited by two sections 
belonging to Sir Joseph Hooker. 
As these were the only survivors of the comparatively large 
number of slides which had from time to time appeared, it 
was thought advisable, without delay, to describe such ana- 
tomical details as could be observed under the microscope. 
It was pointed out, however, in the course of the paper, that 
certain difficulties could only be cleared away upon obtaining 
fresh slides through different parts of the organism, or in 
a different state of preservation. 
For this reason it was decided to restrict the description 
to matters of fact, and to avoid, as far as possible, theoretical 
considerations concerning the systematic relations of the 
plant 2 . 
In the paper already referred to it was shown that the 
plant consisted of the following parts: — (i) a medullary 
portion of filaments passing in all directions, (2) a cortical 
portion in which the cell-rows were disposed radially, and 
1 Annals of Botany, III. 141. 
2 See Hooker, On Pachytheca, Annals of Bot. III. 135, for a summary of the 
views of different authors. 
[Annals of Botany, Vol. V. No. XVIII. April, 189s ] 
