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THE GENOTYPICAL RESPONSE OF THE PLANT 241 
30 plants in the row of each biotype. The angle taken up by the 
main axis and the basal branches (columns 4 and 5) has been indi- 
cated by the terms erect, ascending, procumbent and prostrate. The 
measurements were made in 1921, and the different biotypes are ar- 
ranged as to the length of the main axis (column 2). 
The biotype represented by field no. 169 is figured in fig. 14, 
field nos. 170 and 168 are shown in figs. 15 and 16, and nos. 159 and 
Fig 14. Atriplex litorale, field 
n:0 169. Plant to the left 
raised under ordinary field 
condition; the plant to the 
right raised in sand culture. 
160 in figs. 17 and 18. The biotypes represented are selected so as to 
give an idea of the great variability in branching habit. It should 
also be said that each of the 17 biotypes in the list appear to be con- 
stant throughout, the small differences seen between the individuals 
of the same type being certainly due to fluctuations in soil etc. They 
resemble in all essentials the separate mother-plants from which they 
originated. This fact speaks in favour of the assumption that auto- 
gamy is the rule in this species. A few mother-plants have upon iso- 
