An introduction to the study of the comparative anatomy of animals . eadily, and may be seen to contain a network of asubstance which stains more deeply than the rest. This intra-nuclear network, because of its strong affinity for certaincolouring matters, is called ckromatin. The body of thecorpuscle may also be observed to be made up of a networkof a denser substance containing a more fluid substance in itsmeshes. The red colour of the body of the corpuscle is dueto the presence of an iron-holding compound named haemo-globin, which can be separated out by shaking up blood with 73 Digitized b
An introduction to the study of the comparative anatomy of animals . eadily, and may be seen to contain a network of asubstance which stains more deeply than the rest. This intra-nuclear network, because of its strong affinity for certaincolouring matters, is called ckromatin. The body of thecorpuscle may also be observed to be made up of a networkof a denser substance containing a more fluid substance in itsmeshes. The red colour of the body of the corpuscle is dueto the presence of an iron-holding compound named haemo-globin, which can be separated out by shaking up blood with 73 Digitized by Microsoft® / / 74 COMPARATIVE ANATOMY ether. When separated, the hsemoglobin crystalHses out mprisms. The hjematids do not spontaneously alter their shape,but they are very elastic, so that they can easily be squeezedthrough passages smaller than themselves, and regain theirshape after the passage, as may be seen in the capillaries ofthe frogs foot. The white corpuscles or leucocytes are much fewer innumber than the red, though their relative number varies con-. rig- 13- fl, Red blood corpuscles (ha^matids) of the frog, stained with safranin andmuch magnified, to show the nucleus and nuclear network. br, anamoeboid coarsely granular leucocyte from the frogs blood, showing trifidnucleus ; b2^ dj, b^, other forms of leucocyte from the frogs blood, c,discoid non-nucleated hjematids from human blood, much magnified ;c/, C2f CJ, different forms of leucocytes from human blood. siderably in different individuals, and in the same individualat different times. A leucocyte, as it appears in freshly-drawnfrogs blood, when viewed under the microscope, is a minutecolourless body of smaller size than the red corpuscles, measur-ing some ooiy mm. in diameter. It consists, like the hsraatid,of a protoplasmic body, containing a nucleus. The nucleus isnot easily seen in a living corpuscle, but it becomes apparenton treatment with acetic acid, and it stains deeply with carmineand other colourin
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