INTERNAL STRUCTURE OF PLANTS. 
9 
observed. The effect upon the Algce was much slighter, and 
only Sphcerococcus ciliatus, Ulva linza, and U. lactuca, 
assume a blue colour. The author further instituted re- 
searches respecting the horn-like albumen-cells ; first, of those 
of Monocotyledons, when he found the four following principal 
modifications: — a. Albumen-cells, which are coloured yellow 
by diluted tincture of iodine, becoming yellowish-brown upon 
being dried, and which assume their former yellow colour 
again on being moistened, and which, in fact, behave them- 
selves in quite the same manner as the common woody tissue. 
This takes place, as far as the author investigated, with the 
albumen of all Palms, for instance, with Rliapis acaulis, 
Manicaria saccifera, &c. Z>. Albumen-cells, which exhibit 
first a yellow, subsequently a brown colour with an admixture 
of violet, upon the action of iodine, which become clearer 
or darker yellow-brown upon being dried ; and upon being 
soaked again, become violet, with a brown admixture ; as 
Iris pratensis, atomaria. Allium glohoswm, odorum, sihiri- 
cum, Asphodelus luteus, Anthericum ramosum, Czachia 
liliastrum, Eucomis punctata, c. Albumen-cells, which, 
upon the action of iodine, become first yellow, then brown, 
finally dirty violet ; when dried, red-brown ; when soaked 
again, violet, with a partial transition to deep violet blue ; as 
Iris aurea. Asparagus dauricus, maritimus, Scilla peru- 
viana, Hyacinthus romanus, amethystinus, Lilium bulbi- 
ferum, Tigridia pavonia, Convallaria racemosa. Yucca 
gloriosa. d. Albumen-cells, which, by the application of 
iodine, are coloured with a lively violet ; when dry, red brown ; 
soaked again, beautifully violet or deep violet blue. Ixia 
hyalina, squalida. Gladiolus tristis, Ruscus racemosus, Velt- 
heimia viridifolia. The author has investigated, with less 
care, the seed of Dicotyledons with horn-like albumen, because 
the phenomena, as far as he observed them, were the same as 
in the Monocotyledonous plants. Caustic potass acts, accord- 
ing to the author, very consider ably upon those albumen-cells 
which become coloured blue by the application of iodine. 
Those upon which the alkali acted most slightly, were fur- 
nished with considerably thicker walls. It was distinctly 
401 2 C ’ 
