in 



'////: DIGESTIVE APPARATUS l\ V.H/.W.l /./.I. 



Fig. 217. 



I.KAN, M Of > P ..,:SIC ARTKUY WITH ITS KAMI- 

 I H ATIO.NS STi DL)KI> WITH MAU'KiUIAN COU- 

 1 L MsI'tuS* 



are composed of red blood-globules and coloured corpuscles, either free or 

 included ill colls. Sometimes uucliaugcd blood-discs are seen included in 



a cell ; but more frequently the 

 indiidt '.! blood-discs are altered 

 both in form and colour. Besides 

 these, numerous deep-red, or red- 

 dish-yellow, or black corpuscles 

 and crystals, either single or aginv- 

 gated in masses, are seen diffused 

 throughout the pulp substance ; 

 these, in chemical composition, 

 are closely allied to the hiemutim: 

 of the blood. The colourless ele- 

 ments consist of granular matter; 

 nuclei, about the size of the red 

 blood-discs, homogeneous or gra- 

 nular in structure; and nucleated 

 vesicles in small numbers. These 

 elements form a large proportion of 

 the entire bulk of the spleen in well- 

 nourished animals ; whilst they 

 diminish in number, and occasion- 

 ally are not found at all, in starved 

 animals. The application of ehenii- 



cal testg ^^ ^ tb ^ cgscn . 

 ,-1, , . J i N 



tially a protcine compound.) 



_ _ * , _ , * rni 



Malpujhtan corpuscles. These 

 are contained, like the pulp, in the meshes of the fibrous framework, and arc 

 enveloped by this pulp. Scattered along the track of the small arteries. 

 these corpuscles are visible to the naked eye, and appear as whitish closed- 

 sacs, cells, and nuclei floating in a plasma. The 

 Malpighian corpuscles are constituted by the adven- 

 titious tunic of the arteries, in which lymphoid ele- 

 ments are accumulated at certain points. They 

 are therefore allied to the closed follicles of the 

 intestines. (These splenic or Malpighian corpuscles, 

 are round, whitish, semi-opaque bodies, glutinous 

 in consistence, and disseminated throughout the sub- 

 stance of the organ. They are more distinct in 

 early than in adult life or old age, and vary con- 

 A si: SULK si'i.i-Mc CORPUS- sidcrably in size and number. From the manner 

 < i.i . i I:M TIIK SPLKKN in which they are appended to the sheaths of the 

 "| 'in, ox. smaller arteries and their branches, they resemble 



1, External tunic, or mem- the buds of the moss-rose. Each consists of a mem 

 bran.i pr<>] in a ;_',<; ran- uranous capsule, composed of fine pale fibres inter- 

 Ju'smllir'a^erv;' 11 ^ ! acin g in a11 directions. The blood-vessels rainify- 

 Its sheath, derived from ing on the surface of the corpuscles, are the larger 

 the external tunic of the ramifications of the arteries to which the sacculus 

 spleen, with whirh the { 6 connected, and also of a delicate capillary plexus, 

 neS 8d< COD " Bimilar to that Hrr<>uiuling the vesicles of other 



glands. These vesicles have also a close relation 



with the veins, and the vessels begin on the surface of each vesicle through- 

 out the whole of ite circumference, forming a dense venous mesh in which 



Fig. 218. 



