REYIEWS. 
411 
rubiaceous plants, and some others, are found to exhibit similar characters ; 
and these cases are all described in the work before us. 
Fig. 3. 
ENLARGED SIX TIMES. 
The dotted lines with arrow-heads show the direction in which the pollen must 
be carried to each stigma to insure full fertility. 
The discovery? of still more complex sexual arrangements in the 
Purple Loosestrife ( Lythrum salicaria) was made by Mr. Darwin and de- 
scribed by him, soon? after the publication of his observations on the 
e e 2 
