26 



PHYSIOLOGY. 



blonTf.^,.1 K .r"""'"i'^'"'" serum, which soaks out of the 

 bood-vessels by the mere physical process oUransuclation ; a mor- 

 whi h ''c % fl-d occasions the condition called anasarca, 



finger, recognised by the sk,n pitting under the pressure of the 



SIMPLE CELLS FLOATING IN THE ANIMAL FLUIDS. 



Of these we have examples in the corpuscles of the blood, chyle 

 and lymph. The corpuscles of the blood consist of an in;^ 



Er Trf/f^'T T' ' -^""'^'"^^ «"'^' --eted fnhf 



there IS a brigh spot m the centre, which by many has beei re- 

 garded as a nucleus. The form of the disc is readily altered bvrea 

 gents, the membrane of the cell-wall being readily perLabt bylitS 

 either mwards or outwards, as the relative density of the content^ 

 of the cell and the surrounding fluids may direct contents 



It IS supposed that these cells contain a nucleus, though it cannot 



It ct'in tit'of^n' '"'° "^" "" ""^ ^"^P"^'^''^^ -^ f-™- blood, as 

 ih^tWnuf, °"P^™"^ vertebrata. Dr. G. 0. Rees states 

 hoLb ,T '^'^""S""^'" ^ ""•=!«"« on the ruptured cell-walls, al- 

 though they escape observation when within the corpuscles in ion- 

 sequence of their high refractive power. 



Their size varies in the same individual, and they bear no con- 

 stant relation to the size of the animal. In man their average dk- 

 meter is about l-3a00ths of an inch * 



Chemical composUwn.-Globultne is e. proteine compound and 



or.!": tof of'tlf"'""^ '"'" °"^"- ^""^'^"^^^ "^'*' --'' '■'-"'he 

 rafed fe r if "^ =ompo™ds. ffcematine, when sepa- 



rated from ^^'bu^nous matter, ,s of a dark brown hue, its formula 

 1. C. 44, H. 22, N 3, O. 6, P. 1. The red colour is not due to the 

 presence of iron since, as Scherer has shown, it may be en&ety 

 dissolved out without destroying the colour ei'"ieiy 



diffeVnfr'n/" - "'-'S^Z'^^'^l'-^'i corpuscles there is considerable 

 cleaTd cell/K'""'™;. ^°'' physiologists look upon them as nu- 

 SDlftl. f \ T"^ ''!,P°*7 ^'^■•"P^ducing themselves, either by 

 Dr Rfe, '^hi r ^"? ""''""^'""^ ''^ "' '^''™" ^^g^^"*^. °r, as 

 miscle bv wh- K f"''"' ^^ f .hour-glass contraction of the cor- 

 ^r:d!rced'A:mtcr ""^^"'''--'^ circular bodies were eventually 



thJt°of''alMr''?b V^"" ""''7°' '^^y '>^^« ^" °"Si» '=°™">°n 'o 

 fort^H u , *"■■ '""f '• '" 'he embryo of the bird, they are 



formed in that portion of the germinal membrane known as the 

 vascular layer; this consists of delicate cells very uniformly dis! 

 posed, and whilst capillary vessels are formed by^he union of the 



