8 Marshall Ward and Dunlop. 
fats and grains which there were grounds for thinking were 
aleurone grains. To confirm this supposition sections were 
cut and placed in a two per cent, solution of 'mercuric 
chloride in absolute alcohol, and were left in it for about forty- 
eight hours, washed for half a minute in water, stained rapidly 
with eosin, and mounted in a solution of a neutral salt, potas- 
sium acetate being used. On examining the sections a large 
number of aleurone grains were found in the cells, but on 
examining the grains no enclosure could be detected within 
them (Fig. 15). Sections were placed in the alcoholic solution 
of mercuric chloride as before and left for twenty-four hours, 
then washed in absolute alcohol, stained rapidly with eosin, 
washed for half a minute in water, and mounted in a solution 
of potassium acetate. On examining these sections it was 
found that the aleurone had been dissolved out by washing in 
the water, leaving a reticulum of protoplasm in which the 
aleurone grains had been lying, and showing a well-stained 
nucleus in each cell (Fig. 16). 
Sections of the cotyledons were cut and examined dry, 
they were a light yellow in colour ; on adding water the cells 
became more distinct, and oily globules separated out, which 
on removal of the water dissolved in alcohol, chloroform and 
ether. The sections consisted of about six or seven rows of 
cells, the outer row on each side being arranged very regularly 
and with their outer walls slightly thickened. The second 
row on the one side consisted of columnar cells, while those in 
the centre were more irregular and larger, and with a number 
of intercellular spaces between them (Fig. 17). 
Sections were treated with the alcoholic solution of mercuric 
chloride for twenty-four hours, washed for half a minute in 
water, stained with eosin and mounted in a solution of potas- 
sium acetate. On examining the sections it was found that 
the cells contained a large amount of aleurone, which seemed 
to be similar to that contained in the endosperm, as no enclo- 
sure could be detected within the grains which, on the addition 
of water, swelled up and dissolved. 
The cells of the embryo are thin-walled and parenchyma- 
