. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 000 EVENINGS AT THE MICROSCOPE. so that by taking hold of one you may lift a bristling group of scores. Somewhat on the same principle are the cal- careous and siliceous pins (spicula) of a Sponge held to- gether by mutual interlacement. Yet their cohesion is aided by the tenacity of the living sarcode which invests them; for I have found that specimens of Grantia (cal- careous Sponges with needles of three rays), when long macerated in water, so that the sarcode
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 000 EVENINGS AT THE MICROSCOPE. so that by taking hold of one you may lift a bristling group of scores. Somewhat on the same principle are the cal- careous and siliceous pins (spicula) of a Sponge held to- gether by mutual interlacement. Yet their cohesion is aided by the tenacity of the living sarcode which invests them; for I have found that specimens of Grantia (cal- careous Sponges with needles of three rays), when long macerated in water, so that the sarcode is dissolved, have very slight power of cohesion among their spicula. To understand the structure of a sponge we will shave a thin sectional slice from this Halichondria suberea. This when alive is of an orange colour; and is always found closely investing turbinate, or top-shaped, shells which are inhabited by Hermit-crabs. We will macerate the slice in tepid water for a quarter of an hour, and then examine it in the live-box. The surface is a thin layer of greater density than any other part, and is composed of coloured fleshy granules,—. SECTION OF SPONGE. omitting for the present, the skeleton. Of the same sub- stance is the whole slice composed, but looser and more open as it recedes from the surface. It is separated by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gosse, Philip Henry, 1810-1888. London : Society for Promoting Christian Knowledge
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