VARIATIONS OF BLOOD. 91 



sence of carbonate of soda has been proved by Lehmann 

 and others. 



In illustration of the characters which the blood may 

 derive from the phosphate of soda, Liebig points out the 

 large capacity which solutions of that salt have of absorb- 

 ing carbonic acid gas, and then very readily giving it off 

 again when agitated in atmospheric air, and when the 

 atmospheric pressure is diminished. It is probably, also, 

 by means of this salt, that the phosphate of lime is held in 

 solution in the blood in a form in which it is not soluble 

 in water, or in a solution of albumen. Of the remaining 

 inorganic constituents of the blood, the oxide and phos- 

 phate of iron referred to, exist in the liquor sanguinis, 

 independently of the iron in the corpuscles. 



Schmidt's investigations have shown that the inorganic 

 constituents of the blood-cells somewhat differ from those 

 contained in the serum ; the former possessing a consider- 

 able preponderance of phosphates and of the salts of 

 potash, while the chlorides, especially of sodium, with 

 phosphate of soda, are particularly abundant in the latter. 



Among the extractive matters of the blood, the most 

 noteworthy are Kreatin and Kreatinin. Besides these, 

 other organic principles have been found either constantly 

 or generally in the blood, including casein, especially in 

 women during lactation : glucose, or grape-sugar, found in 

 the blood of the hepatic vein, but disappearing during its 

 transit through the lungs (Bernard) ; urea, and in very 

 minute quantities, uric acid, (Garrod) ; Tiippuric and lactic 

 acids ; ammonia (Richardson) : and lastly, certain colouring 

 and odoriferous matters. 



Variations in healthy Mood under different Circumstances- 



As the general condition of the body depends so much 

 on the condition of the blood, and as, on the other hand, 

 anything that affects the body must sooner or later, and 



