. Hand-book of physiology . rms of blood-crystals :— Fig. 2, Prismatic, from human 3, Tetrahedral, from blood of guinea-pig. F 66 THE BLOOD: Carbon ....Hydrogen ....Nitrogen ....Oxygen, with a little Sulphur Fig. A. 55-18 7-14 17-40 20-28 For the best ac-count of this interest-ing subject, which isstill involved in muchobscurity, the studentis referred to Lehmann(cciii. vol. iii., pp. 485— 495); to a good re-view of it by (cxc. , p. 348); and fora notice of the mostrecent information, toDr. Days Report onAnimal Chemistry (cxc. vol. xv., p. 547). Vital Properties
. Hand-book of physiology . rms of blood-crystals :— Fig. 2, Prismatic, from human 3, Tetrahedral, from blood of guinea-pig. F 66 THE BLOOD: Carbon ....Hydrogen ....Nitrogen ....Oxygen, with a little Sulphur Fig. A. 55-18 7-14 17-40 20-28 For the best ac-count of this interest-ing subject, which isstill involved in muchobscurity, the studentis referred to Lehmann(cciii. vol. iii., pp. 485— 495); to a good re-view of it by (cxc. , p. 348); and fora notice of the mostrecent information, toDr. Days Report onAnimal Chemistry (cxc. vol. xv., p. 547). Vital Properties and Actions of the Blood.* The life of the blood is manifested, as aheady said, in itscoagulation, and the subsequent more perfect organisationwhich it may attain when it coagulates among healthy livingtissues. But, in a higher degree, its life is shewn in its de-velopment and self-maintenance, in its Hability to idiopathicdisease and death, and in the purpose and relation which con-nect it with the other living Fig. 4, Hexagonal crystals, from blood of squirrel. On these six-sided plates, prismatic crystals, grouped in a stellate manner, notunfrequently occur; (after Tunke, cciv.) * The following portion of this chapter contains an abstract of part ofthe Lectures on the Life of the Blood, delivered by Mr. Paget, at theCollege of Surgeons, in May, 1848. ITS DEVELOPMENT. 67 In the development of tlie blood, little more can be tracedthan the processes by which the corpuscles and fibrine areformed. In all the Vertebrata, two sets of red corpuscles aredeveloped at different periods of life: a first set, which existalone in the blood, till lymph and chyle begin to be formed;and a second set, which are formed from the lymph- and chyle-corpuscles, and gradually supersede the first set. The cor-puscles of the first set are, in the first instance, part of theembryo-ceUs which form the mucous or vegetative layer ofthe embryoes in Mammalia and birds, and the whole innersurfac
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