Statice Limonium on the Banks of the Humber. 123, 
gland faces, was removed from the leaf by boiling with caustic 
potash. It was then mounted and stained with chlor-zinc 
iodide. When examined under a low magnification, the 
gland appeared yellow, but on examination with a one- 
twelfth oil immersion, it was found that in each of the four 
inner sectors there was a circular area which stained blue, 
and, towards the inner side of this area a minute white- 
spot which looked like a hole. According to this result,, 
there is in each of the central triangular sectors, an area 
which is not cuticularised, and consequently secretion can 
occur through those areas. These are additional to Vuil- 
lemin’s ‘ trou/ whatever the nature of the latter may be. 
Counts were made of the number of glands and stomata per 
square millimetre of leaf surface on leaves from different 
localities. They are arranged in order of normality of station, 
the normal leaf from Welwick first. The data concerning the 
sizes of the leaves has unfortunately been mislaid, but they 
may be taken as typical of their respective localities. Counts 
were made from different parts of the leaf, and each number is 
the mean of twelve counts on the same leaf. 
Upper surface . Lower surface .. 
14 glands + 96 stomata 15 g. + 5i s. 
5 g- + 3° s. 5 g- + 2o s. 
14 g- + 6 3 m r 4 g- + 53 S- ; 
20 g. + g6 s. 19 g.-t-Si s. 
T 4 g-+53 s - 14 g. j-40 s. 
10 g. + i03 s. 12 g.-jC7° s- 
9 g.4-65 s. 10 g. f5y s. 
The number of glands is about the same on either side of 
the leaf. In all cases, however, stomata are more numerous 
on the upper side than on the lower. The difference between 
the numbers on leaves of normal size from Welwick and on 
Welwick (E) ... 
Hedon Haven (B) 
Saltend (A) 
Kilnsea (F) 
Easington (G) 
Easington (G) 
Garden plant 
abnormally large leaves from Hedon Haven is due to the 
fact that the increase in leaf area was accompanied by an 
increase in size of the epidermal cells : the number of epidermal 
cells seen along a diameter of the field of the microscope in 
the latter was only half that seen in the former. There is 
no difference between the numbers of glands per square 
millimetre on the normal leaves from Welwick and the small 
leaves from Saltend and Easington ; but the further data 
necessary for comment on this is lacking. 
The ratio of the number of glands to the number of stomata 
per square millimetre is given in the follownig table : — 
Upper Surface. Lower Surface.. 
Welwick {E) 
1 : 6-9 
1 
: 3'4 
Hedon Haven (B) 
1:6 
1 
•• 4 
Saltend (A ) ... 
... 1 : 4-5 
1 
: 3 -& 
Kilnsea (F) ... 
1 : 4-8 
1 
: 4-3 
Easington (G) 
... 1 : 3-8 
1 
: 2 •( 
Easington (G) 
... 1 : 10-3 
1 
: 5-8 
Garden plant ...• 
... 1 : 7-2 
1 
: 5 - 9 * 
1922 Apl. 1 
