30 
ACTIVE ALBUMEN 
Active albumen can be stored up in higher and lower plant- 
forms and in most different parts of plants. Thus we obtain 
proteosomes by coffeïn or antipyrin with leaves of all insectivo¬ 
rous plants except with Utricularia. Drosera shows it in all parts 
of the leaves, stem, and flower. 1 ) The most remarkable however 
among all insectivorous plants is in this regard Cephalotus , con¬ 
taining in all parts astonishing quantities of stored-up active 
albumen. Further objects are : The subepidermial cells of the 
leaves of Crassulaceae as Cotyledon, Echeveria, Sedum; the 
epidermial cells of Primula sinensis and Pelargonium ; the hairs 
of the stems of Begonia and of many other plants; the petals of 
Cyclamen, Cornus, Tulipa, Epidendron ; the anthers of Eugenia, 
Melaleuca and Forsythia; the pistils of Crocus vernus, Rhodo¬ 
dendron, Salix, Euphorbia; the peduncles and petals (sometimes 
also young seeds) of : 
Gentiana, Primula, Scrofularia, Impatiens Sultani, 
Hoteia japonica, Pirus Malus, Prunus Cerasus, 
Amorphophallus Rivieri, Viburnum rugosum, 
Sorbus aucuparia, Thea chinensis ; 
the flowers and young leaves of Rheum, Acer, Populus, Acacia, 
Crataegus oxyacantha, Mimosa pudica ; the nectaria of Passiflora. 
In some plants it is found only at certain stages of develop¬ 
ment, as in the petals of malvae, in unripe snowberries (Sym- 
phoricarpus racemosus), in cotyledons of Helianthus, in the 
larger cells of Vallisneria-leaves. 
Whether fungi ever store up active albumen as a reserve- 
material is still doubtful ; 1 2) among the algae are the various 
kinds of Spirogyra the most noticeable ones, Vaucheria contains 
it occasionally, Mesocarpus, Oscillaria, Oedogonium, Sphaero- 
plea, Palmella, Desmidiaceae and Diatomeae never, so far as 
our observations reach. Of higher organised plants not contain¬ 
ing this reserve-material may be mentioned : Leaves and roots 
1) The socalled aggregation observed first by Darwin with the tentacles of 
Drosera is a different process, but Bokorny has shown, that there exist certain points 
of connection between the two phenomena. Compare Pringsheims Jahrb. Vol. 20 
p. 465. 
2) We have however observed silver-reduction in black dots with spores of 
Gymnosporangium, and with Saccharomyces cultivated at low temperature in a 
solution free of sugar. 
