The microscope and its revelations . lls always presenta nearly spherical or spheroidalform; sometimes, however, when ^^they are closely pressed-together,they become somewhat polyhedi-al,from the flattening of their wallsagamst each other (Eig. 322). ^Their intervals are traversed by a \minute network of blood-vessels, i^_from which they derive theirsecretion; and it is probably bythe constant moistening of theirwalls with a watery fluid, that then: Areolar and^Jij?ose tissue;, i 1-1 -xr, J. 0^)«, lat-cells; 0, 0, fibres of contents are retamed without areolar tissue,the least transudation, al
The microscope and its revelations . lls always presenta nearly spherical or spheroidalform; sometimes, however, when ^^they are closely pressed-together,they become somewhat polyhedi-al,from the flattening of their wallsagamst each other (Eig. 322). ^Their intervals are traversed by a \minute network of blood-vessels, i^_from which they derive theirsecretion; and it is probably bythe constant moistening of theirwalls with a watery fluid, that then: Areolar and^Jij?ose tissue;, i 1-1 -xr, J. 0^)«, lat-cells; 0, 0, fibres of contents are retamed without areolar tissue,the least transudation, although these are quite fluid at the temperatui-e of the living , when fllled with their characteristic contents, havethe peculiar appearance which has been akeady described as * Thus it has been observed in the lining of the windpipe of a decapitatedcriminal, as muQh as seven days after death; and in that of the river-tortoise,it has been seen fifteen days after death, even though putrefaction hadalready far 716 VEETEBEATED AiflMAXS appertaining to oil-globules (§ 99), being very bright in tbeircentre, and very dark towards their margin, in consequenceof their liigh refractive power; but if, as often happens inpreparations that have been long mounted, the oily contentsshould have escaped, they then look like any other cells of thesame form. Although the fatty matter which fills these cells(consisting of a mixture of stearine or of margarine witholeine) is liquid at the ordinary temperature of the body of awarm-blooded animal, yet its harder portion sometimes crys-tallizes on cooling; the crystals shooting from a centre, soas to form a star-shaped cluster.—In examining the structureof Adipose tissue, it is desirable, where practicable, to haverecourse to some specimen in which the fat-cells lie in singlelayers, and in which they can be observed without disturbingor laying them open; such a condition is found, for example,in the mesentery of the mouse
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