On the Second Proposition of the Mechanical Theory of Heat. 365 

 Composition of Salmon's Flesh, in 200 grms. 





Composition of 

 insoluble tissue. 



Composition of 

 nutritive material. 



Composition of 

 efifete material. 



Albumen 



2516 

 0171 

 0065 



12-470 

 0085 

 0032 



4-360 

 0-945 



0-828 

 0-058 



Phosphoric acid... 

 Potash 



Soda, total found 



EflFete, in 100 parts. 

 Phosphoric acid . . 63'3 

 Potash 46-6 



Theory. 

 43 

 57 



In the present case the proportion of albumen of the nutritive 

 material is no less than twice as large as in ox-flesh ; and about 

 two thirds of the amount of this substance present was in excess 

 of that required for immediate use. The necessity of this large 

 store of nutritive material in salmon's flesh may be accounted 

 for by a consideration of the rapid growth of the fish, amounting 

 in a few months to several pounds during their migration to 

 the sea. (I could not ascertain where the fish was taken.) 



The high proportion of phosphoric acid and potash in the 

 eff'ete state is a remarkable circumstance, considering that 

 salmon is constantly subjected to loss of substance from liquid 

 diff'usion ; but this is explained by the fact that phosphoric acid 

 and potash in salmon, in the efiete condition, are not present in 

 the exact proportion to make a crystalloid potash salt ; there is 

 an excess of phosphoric acid present ; and therefore these sub- 

 stances are less crystalloid and consequently less diflfusible than 



in the higher class of animals. 



[To be continued.] 



XLIII. On the Connexion of the Second Proposition of the Me- 

 chanical Theory of Heat with Hamilton's Principle. By R. 

 Clausius*. 



INDUCED by a memoir of mine published not long previ- 

 ously t, M. Szily has instituted an interesting consideration 

 of the second proposition of the mechanical theory of heat J, in 

 which he arrives at this result — that the equation which expresses 

 that proposition can be deduced as an immediate consequence 

 from Hamilton's principle. 



* Translated from a separate copy, communicated by the Author, from 

 Poggeudorff 's Annalen, vol. cxlvi. p. 585. 



t Sitzungshericht derNiederrhein. Ges ells chaft fur Natur- und Heilkunde, 

 1870; Phil. Mag. Sept. 1871, p. 161. 



: Phil. Mag. May 1872, p. 339. 



