130 _ THE JOURNAL OF BOTANY 
for * absent,” since itis often quite as important to specify definitely 
the areas in ae a plant or animal does not exist as those in 
which it i 
In cases, especially where large areas are being dealt 
with, a a elaborate diagram will suffice. In Great Britain we 
have Watson’s eighteen provinces to fall back upon, and also 
his mor eight vice-provinces. The eighteen provinces are too few 
in number to give a good pictorial effect. Also, the twelve Iris 
distiiote| as proposed by -soncadee — used in Cybele Stharkies 
approach in area more closely to the vice-provinces than to the 
provinces. The vice-provinces Net osiad are preferable for use— — 
86 .. 34 
33 31 30 
32 29 
: 27 28 
ll 12 26 25 24 
10 23 22 
7 5 21 20 19 
3 4 18 15 14 12 11 
17 16 13 8 10 
$89 7 
a ££ 6 
bo oO © © 
1 
Fie. 2. 
and they combine with the Irish age to form an excellent 
diagram. This is seen in fig. 2, in which also, to serve as an 
illustration, the range of Trollius ins is shown by the use of 
heavy- a type as ‘suggested. 
There is of course nothing new in the application of letters or 
ibuti 
such detail or to apply it to our own islands. The advantage of 
the plan, as I have said, is its ease and cheapness; by it we can, in 
fact, map without maps, 
‘‘A Graphic Formula to express Geographical Distribution ” (Proc, Zool. 
bit tei 1890, pp. 607-9). 
