Hygienic physiology : with special reference to the use of alcoholic drinks and narcotics / by Joel Dorman Steele.

  • Steele, Joel Dorman, 1836-1886.
Date:
[1888], ©1888
Catalogue details

Licence: Public Domain Mark

Credit: Hygienic physiology : with special reference to the use of alcoholic drinks and narcotics / by Joel Dorman Steele. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    ti, 7.1 THE COMPOSITION OF THE BOH Pio. 2. pure-white residue* may be crumbled into powdez with the' fingers. We thus see thai a bone receives hardness and rigidity from its mineral, ami tenacity and elasticity from its animal matter. The entire bone is at first composed of cartilage, which gradually ossifies or turns to bone.f Certain portions near thf joints are long delayed in this process, and by their elasticity assist in breaking the shock of a fall.J Hence * From bones thus calcined, the phosphorus of the chemist is made. See Steele's Popular Chemistry, 114. If the animal matter be not consumed, but only charred, the bone will be black and brittle. In this way, the bone-black of commerce is manufactured. t The ossification of the bones on the sides and upper part of the skull, for example, begins by a rounded spot in the middle of eaeh one. From this spot the ossi- fication extends outward in every direction, thus gradu- ally approaching the edges of the bone. When two adjacent bones meet, there will be a line where their edges are in contact with eaeh other, but have nol united; but when more than two bones meet in this way, there will be an empty space between them at their point of junction. Thus, if you lay down three coins upon the table with their edges touching one an- other, there will be a three-sided space in the middle between them; if you lay down four coins in the same manner, the space between them will be four-sided. Now at the back part of the head there is a spot where three bones come together in 'this way, leaving a small, three-sided opening be- tween them: this is called the posterior fontanelle. On the top of the head, four bones come together, leaving between them a large, four-sided opening this is called the anterior fontanelle. These openings are termed the fontomeBeg, because we can feel the pulsations of the brain through them, like the bubbling of water in a fountain. They gradually diminish in size, owing to the growth of the bony parts around them, and are completely closed at the age of four years after birth.—Dalton. $ Frogs and toads, which move by jumping, and consequently receive 2 I '/'//> Thi'jh-i F> mnr, M hit'jth'i i