The nozzles of small lamps are inserted in the tubes L, L, for illuminating the webs in a dark field; the light from these lamps is admitted through apertures in the strong hollow cylinder above mentioned (for illumination, see p. 385).
The tax on doors and windows is levied in each case according to the number of apertures, and is fixed with refetence to population, the inhabitants of the more populous paying more than those of the less populous communes.
This system of channels is in communication with the outer atmosphere through numerous small apertures, known as stomata, which are abundant upon the leaves and young twigs, and gaseous interchange between the plant and the air is by their assistance rendered constant and safe.
This power of varying the area of the apertures by which gases enter the internal reservoirs is not advantageous to the gaseous interchangesindeed it may be directly the reverse.
Most of these extend through narrow apertures foramina pneumatica - into the hollow bones, sometimes, e.g.
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