. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ucleine has beengiven. The cell wall ofthe white corpus-cles does not ap-pear to be is viscid, andhence these bodiestend to agglutinateto one another : inaspect it is granu-lar. The contentsappear to be an al-buminous solution,in which fine gran-ules are we havedescribed the mes-enteric glands asthe original placeof formation of theblood-cells, it is tobe understood thatthese become per-fected in the circu-lation ofthe blood;and fr
. A text-book on physiology : for the use of schools and colleges : being an abridgment of the author's larger work on human physiology. ucleine has beengiven. The cell wall ofthe white corpus-cles does not ap-pear to be is viscid, andhence these bodiestend to agglutinateto one another : inaspect it is granu-lar. The contentsappear to be an al-buminous solution,in which fine gran-ules are we havedescribed the mes-enteric glands asthe original placeof formation of theblood-cells, it is tobe understood thatthese become per-fected in the circu-lation ofthe blood;and from what willbe said respectingthe function of theliver, it may be in-ferred that thatgland is the seatof a most important change: there probably they re-ceive their iron. That no special organ is exclusivelycharged with the duty of forming them appears fromthis, that the first form of blood-cells arises in the germ-inal area of the embryo when there is, as yet, no the water out of consideration, the predomi- Is the cell wall of the white corpuscles elastic ? What connectiondoes the liver seem to have with the discs ?. Reptile blood-cells magnified 500 diameters. COMPOSITION OF ELEMATIN. 99 nating ingredients of blood-cells are globulin and hgema-tin. The former is a substance approaching, in proper-ties, to casein, or perhaps intermediate between casein and albumen. Haematin is dis-tinguished by itsred color. Whenisolated, it exhib-its the changes oftint characteristicof arterializationin a doubtful man-ner. There are,however, somefacts which leadto the suppositionthat the color ofarterial and ven-ous blood does notdepend so muchon a chemicalchange in the hse-matin as on an al-teration of the fig-ure of the containsabout 7 per cent,of iron. The crystallinesubstance of bloodoccurs under threedifferent forms, inprisms, tetrahe-dra, and hexagon-al tablets. In theprismatic form itis derived fromhuman blood, thatof fishes, and ofsome mammals; Fig. 36.
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