SAPROPHYTES AND THEIR RELATION TO DECAYING BODIES. 99 
water flows down to this place it is stemmed by the membrane, as by a dam, and 
diverted right and left into the two grooves. In this way water is prevented 
from accumulating between the leaf-sheath and haulm, where it might do damage. 
In many reeds the contrivances for irrigation are even more complete than this. 
Sometimes hairs depend from the margin of the membrane in the direction of the 
grooves and, like a wick, lead the water in the proper direction. 
An opportunity will occur later on of showing how the conduction of rain to 
particular spots has an important bearing on the phenomenon of absorption by 
aerial parts of plants: and also in the regulation of transpiration; and how, by 
means of the apparatus for water-irrigation, not only absorptive cells at the 
extremities of roots in the earth, but special organs on the foliage-leaves as well, 
are often supplied with water. 
3. ABSORPTION OF ORGANIC MATTER FROM DECAYING 
PLANTS AND ANIMALS. 
Saprophytes and their relation to decaying bodies.—Saprophytes in water, on the bark of trees, and 
on rocks.—Saprophytes in the humus of woods, meadows, and moors.—Special relations between 
Saprophytes and the nutrient substratum.—Plants with traps or pitfalls for animals.—Insecti- 
vorous plants which perform movements for the capture of prey.—Insectivorous plants with 
adhesive apparatus. 
SAPROPHYTES AND THEIR RELATION TO DECAYING BODIES. 
Whenever plants which take up organie compounds formed in the process of 
decay are the subject of discussion, the first examples that occur to everyone are 
members of the great family of Fungi, specimens of which make their appearance 
wherever dead animals or plants are undergoing decomposition. We recall the 
moulds, plasmodia, puff-balls, and mushrooms, which grow from dead organic bodies, 
and are associated with the unpleasant mouldy and cadaverous smell always 
perceptible in their neighbourhood. 
Many of these organisms do, in fact, belong to the class of Saprophytes. Indeed, 
one group of them is itself the cause of the chemical decomposition of dead plants 
and animals called decay. Their elongated thin-walled cells, the so-called “hyphs”, 
thread themselves through dead bodies, and unite to form strands, bundles, net- 
works, and membranes, the whole constituting a structure to which the term 
“mycelium” is applied. These mycelia are often to be seen, with the naked eye, 
covering large areas. For instance, in damp cellars, mines, and railway-tunnels, any 
old rotten wood-work is clothed with delicate, whitish reticula and membranes. 
The heaps of grape-skins, stalks, and other refuse piled up in the open air by the 
side of vineyards after a vintage, are usually so completely overgrown by mycelia 
