Notes. 
183 
whether the accumulation of the lignin-like substance in the root was 
preparatory to lignification of the walls, but in the stem this was 
suggested by its mode of occurrence. 
The extent of lignification of the phloem and pericycle might 
perhaps vary considerably in different specimens, depending on the 
robustness of the plant, and that again on the cultural treatment. An 
examination of the structure of other annuals collected late in the year 
might perhaps yield results bearing on some of the many problems 
connected with the physiology of plants. 
Jodrell Laboratory, Kew. 
L. A. BOODLE. 
