28 



Prof. Clausius on the Determination of 



Past time. 



Future time. 



Number of 

 years before 

 epoch 1800. 



Excentricity. 



Longitude of 

 perihelion. 



Number of 

 years after 

 epoch 1800. 



Excentricity. 



Longitude of 

 perihelion. 



1,000,000 



00151 



248° 22 



50,000 



00173 



38° 12 



950,000 



00517 



97 51 



100,000 



00191 



114 50 



900,000 



0102 



135 2 



150,000 



00353 



201 57 



850,000 



00747 



239 28 



200,000 



0-0076 



303 30 



800,000 



00132 



313 49 



250,000 



00286 



350 54 



750,000 



00575 



27 18 



300,000 



00158 



172 29 



700,000 



00220 



208 13 



350,000 



0-0098 



201 40 



650,000 



00226 



141 29 | 



400,000 



00429 



6 9 



600,000 



00417 



32 34 



450,000 



00231 



98 37 



550,000 



00166 



251 50 



500,000 



00534 



157 26 



500,000 



0-0388 



193 56 



550,000 



00259 



287 31 



450,000 



0308 



356 52 



600,000 



00395 



285 43 



400,000 



0-0170 



290 7 



650,000 



00169 



144 3 



350,000 



0-0195 



182 50 



700,000 



00357 



17 12 



300,000 



0-0424 



23 29 



750,000 



00195 



53 



250,000 



00258 



59 39 



800,000 



00639 



140 38 



200,000 



0-0569 



168 18 



850,000 



0-0144 



176 41 



150,000 



00332 



242 56 



900,000 



0-0659 



291 16 



100,000 



00473 



316 2 



950,000 



00086 



115 13 



50,000 



00131 



50 3 



1,000,000 



00528 



57 31 







00168 



99 30 









IV. On the determination of the Disgregation of a Body, and on 

 the True Capacity for Heat. By Professor Clausius*. 



IN my memoir K On the Application of the principle of the 

 Equivalence of Transformations to Internal Work "f, I in- 

 troduced into the theory of heat a new quantity having refer- 

 ence to the arrangement of the particles of a body, and which I 

 called the disgregation of the body. This quantity serves to 

 express the total quantity of work which heat can do when the 

 particles of the body undergo changes of arrangement at differ- 

 ent temperatures. Let us suppose that the body undergoes an 

 infinitely small change of state, the change being such that it is 

 reversible, and let the entire work done during this change be 

 represented by dh ; further, let the absolute temperature of the 

 body be called T, and let the calorimetric equivalent of the unit 

 of work be A. We shall then have, as I have shown in the 



* Communicated by the Author, from the Archives des Sciences Phy- 

 siques et Mathematiques for October 1865, having been read August 22, 

 1865, before the Societe helvetique des Sciences naturelles a Geneve. 



f Poggendorff's Annalen, vol. cxvi. p. 73; Liouville's Journal, 2nd 

 series, vol. vii. p. 209. [Phil. Mag. S. 4. vol. xxiv. p. 81.] 



