. St. Nicholas [serial]. theoxygen from the lungs to the rest of the body. Somewere all shriveled up when I saw am your loving reader, Katharine Titch (age 13). 6 L# • oof, •• ^ © ?•* *% 9O • © © O FIG. I. HUMAN RED BLOOD. (Magnified 400 diameters.) Fig. 1 is a photograph of human red bloodcorpuscles four hundred times as large indiameter as the real corpuscles are. Fig. 2 shows a frogs red corpuscles alsofour hundred times the diameter of the realcorpuscles. There is in the frogs corpuscles acore different in composition from the outsidepart; it is blacker in the figure; this is called
. St. Nicholas [serial]. theoxygen from the lungs to the rest of the body. Somewere all shriveled up when I saw am your loving reader, Katharine Titch (age 13). 6 L# • oof, •• ^ © ?•* *% 9O • © © O FIG. I. HUMAN RED BLOOD. (Magnified 400 diameters.) Fig. 1 is a photograph of human red bloodcorpuscles four hundred times as large indiameter as the real corpuscles are. Fig. 2 shows a frogs red corpuscles alsofour hundred times the diameter of the realcorpuscles. There is in the frogs corpuscles acore different in composition from the outsidepart; it is blacker in the figure; this is calledthe nucleus. There is no such nucleus in thered corpuscles of your blood; but when youwere very much smaller than you are nowsome of your corpuscles were also nucleated,and would have looked somewhat like thefrogs, except that yours were round. There were some other corpuscles in theblood which escaped your attention; whenthey are killed and stained they look like ain Fig. 3. They seem alive as they move on. FIG. 2. FROG S RED BLOOD. (Magnified 400 diameters.) their own account; they do not have to hurryon with the blood current; they can cling tothe blood vessels while the red ones run by;they can even leave the blood vessels andtravel through the body; they do not carryoxygen like the red ones, but they are veryuseful in other ways. When your finger is cutdisease germs try to get in, and these whiteblood corpuscles gather at the wound and eatthe disease germs up and so the cut a bone is broken, they hurry to the brokenplace and, ranging themselves between thebroken ends, become bone in a little while andcement and hold the two ends together solidand fast. They are useful in the body some-what as you may be about the house : they cando and seem anxious to do whatever needs tobe done. If, for instance, any other part ofthe body that can get well of a hurt is damaged,the white corpuscles run to its assistance ; theycan become muscle and help the muscles as
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Keywords: ., bookauthordodgemar, bookcentury1800, bookdecade1870, bookyear1873
