SYSTEMATIC SYNTHESIS OF TISSUES. 183 



165. THE SINEWY TISSUE is EVIDENTLY a passive 

 tissue, and does not require the elementary constitution 

 of the active tissues. * 



166. THE ANALYSIS OF SINEWY TISSUES SHOWS that 

 they are entirely wanting in phosphorus, and have but a 

 very little sulphur and an inferior proportion of nitrogen. 



167. THE WHITE AND THE YELLOW DIFFER in the 

 arrangement of their elements, since from the former 

 Gelatine can be obtained, but not from the latter ; there 

 is also a difference in the proportions of their elements. 



168. WHEN THE WHITE TISSUE is BOILED awhile in 

 hot water it is dissolved, and upon cooling forms a jelly 

 called gelatine, or gluten technically, or glue in com- 

 merce. 



169. THIS SUBSTANCE, GELATINE, is never found in 

 the blood, though it is eaten as food, and is the com- 

 ponent of the larger part of the Body. 



1 70. THE FACT MENTIONED SHOWS that Gelatine must 

 Be formed from the Blood by the Tissue in the very act 

 of its formation; that the Gelatine decomposes when 

 it goes back from the tissue into the Blood ; and that 

 the Gelatine eaten must serve some other purpose than 

 nourishing any tissue, for it has the Elements of no 

 other but the sinewy ; therefore it must be useful only 

 in producing heat, to which purpose also the decompos- 

 ing sinewy Tissue can be applied. 



171. THE SINEWY TISSUE is CONSTITUTED IN PART 

 of Nitrogen, and therefore it must be obtained from 

 some part of the food that contains Nitrogen ; and as in 

 the chicken it must have been obtained from the albu- 

 men, so it must be at all times; but through what 

 changes the albumen passes, to free it of phosphorus 

 and a part of its sulphur and nitrogen, is not known. 

 It is supposed that the fibrin of the Blood is one stage 

 in the process of forming sinewy tissue. It may also 



165. What ? 166. What eaid of ? 16T. How do ? 168. What effect ? 

 169. What said ? 170. What does ? 171. How ? 



