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    cle of large and firm bones , standing as an arch betwixt the lower extremities and the trunk : its arch is wide and strong , so as to give a firm bearing to the body j its individual bones are large , so as to give a deep and sure

    socket for the implantation of the thigh - bone : its motions are free and large , bearing the trunk above , and rolling upon the thigh bones ; and so truly is it the centre of all the great mot-ions of the body , that when we believe the motion to be in the higher parts of the

    spine , it is in truth either the last vertebra of the loins bending upon the top of the pelvis , or the pelvis itself rolling upon the heads of the thigh bones . The pelvis takes its name froHi its partly resembling a basin in its form : it is constructed in the adult , of four

    large bones : of the os sacrum behind ; the ossa innominata on each side and before 5 and the os coccygis below . The os sacrum or hinder bone is the base , on which the spine , and of course the whole trunk rests : it is of

    an irregular triangular shape , and so formed as to guard the nerves proceeding from the end of the spinal marrow . Within this bone , there is a triangular cavity , which is a continuation of the canal of the spine , and here the spinal marrow ends , and branching into a

    great many thread-like nerves has the form of a horse ' s tail . These nerves go 6 ut by five great holes , which are on the forepart of the bone to be distributed to different parts . The us coccygis is a continuation of , or rather

    an appendage to , the sacrum ; though called a sinpie bone , it consists of four "ones , in middle age , each bone becoming smaller as it descends , till the last ends almost in a point , and bv ocncling inwards serves to contract the lower opening of the pelvis so as to support effectually the viscera within . I hese two bones , the sucrimi arid

    coccygis are a continuation of the s P » ne , and perform part of its motions , supporti ng , like it , the weight of the My , lodging the spinal marrow , and " "ansmitting some of its nerves ; hence certain authors call them part of the s Ptoe , but others describe them

    ^( connected with the pelvis . The Slles and forepart of this basin arc composed of two bones , corresponding with each other in size and figure , ut from their irregular shape they ^ called ossa innominata , or iiamcless bones . In children , each of these

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    bones consists of three separate pieces , which after the ossification is more perfect , are so firmly united as to make one bone only . They are , however , described as if consisting of three distinct or separate pieces , viz : ] . The os ilium or haunch bone , which is the highest a ; uf constitutes the upper side of the pelvis ; it has its posterior edged firmly and irnmoveahly articulated to the os sacrum : 2 . The os ischiurn , or hip-bone which lies perpendicularly under the ilium , and is the lowest

    point of the pelvis on which we sit . 3 . The os pubis is the last and smallest piece of the three , forming the fore-part of the pelvis , and completing its brim . Each os inaominatuVn has a cup-like hollow for the head of the thigh-bone

    to move 111 . The pelvis is intended for many important purposes in the human frame : first , it is the base for supporting the superior part of the bodyVnext , it is so constructed , as to receive into its sockets , and to roll upon the heads of tihe thigh-bones , by which means it connects the lower extremities with

    the upper parts of the frame , without precluding motion ; and lastly , fty forming a kind of basin at the lower end of the trunk of the body , it assists in sustaining the viscera ; while its outside surfaces , its ridges and projecting points serve as so many convenient places for the origin and insertion of numerous muscles which

    perform by means of it , with the ' advantage of a lever , some of the motions of the trunk and many of those of the lower limbs . Tim thorttx or chest , is that large

    cavity reaching from the neck to the lower end of the breast-bone before , but . e £ tending- f ; trtIk ¦ c clawr 1 wards at the back , and in eluding «!! that space which lies between the opposite ribs . It is intended by an Ail-wise Maker , to afford a secure and coa'imodious residence for the heart , lungs , & , c . and is formed hehind , by the twelve dorsal vertebrae of the spine y on the sides by the ribs and by i lie breast-bone before .

    The ribs , which a re generally twelve in number , form tlie sides of the chest , covering and defending \ hc heart and lungs : they assist also in breathing-, being joined to the . spine by regular hinges which allow of short motions , and to the breast-bone by cartilages which yield to tlie motion of the ribs , and return again from their elastic

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    Natural Theolvpy * No . VIJT . —Mechanical Arrangement of the Body , 4 <) 5

• Citation
  • Monthly Repository (1806-1838) and Unitarian Chronicle (1832-1833), Aug. 2, 1815, page 495, in the Nineteenth-Century Serials Edition (2008; 2018) ncse.ac.uk/periodicals/mruc/issues/vm2-ncseproduct1763/page/31/