Piate LV. 
Transverse section through a haustorium in the act of penetrating 
a small root of Abrus precatorius, the diameter of the 
haustorium being one-sixteenth of an inch. A microtome 
section, stained with hematoxylin and mounted in Canada 
balsam. The interest centres in the nucleus (d). The upper 
part of this shows cells greatly enlarged and furnished with 
granular protoplasm, great nuclei and nucleoli. At d! cells of- 
a slightly younger haustorium are figured. The lower part of 
the nucleus merges into the sucker and contains the gland 
which is narrow and duct-like (i). At 7 the thick-walled, 
lignified, pitted cells are seen in the thickness of the end of the 
cortical fold. For the description of this plate see paragraph 
6 of the text. The smaller drawings, with the exception of d, 
are enlargements of different parts of the haustorium. 
