On New Figures of Equilibrium for Revolving Fluids. 119 



it had been dissolved in a mixture of alcohol and ether. These 

 fractions were those of the 10th rectification. 

 I. 0-2404 grm. gave 0*0928 grm. gold. 



II. 0-5296 grm. gave 0-2038 grm. gold. 



Translated into per-centages, these numbers correspond with 

 the proportion of gold required by a gold salt of parvoline 

 (C 18 II 13 N) containing four equivalents of water ; — 



Experiment. Theory. 



I. II. C 18 H 14 NCl,AuCP+4Aq. 



38-60 38-46 38-55 



The unpromising character of the salts of these fractions has, 

 however, deterred us from making further experiments with 

 them. 



Between 210° and 230° the quantity of distillate was but 

 small, and we have as yet gained no insight into its constitution. 

 From 230° to 280° or 290° several grammes of a thick brown- 

 ish oil came over ; these fractions yielded crystalline platinum 

 salts; it is very probable that they contain chinoline and its 

 higher homologues, lepidine and cryptidine, bases discovered by 

 Greville Williams among the products obtained by the destruc- 

 tive distillation of cinchonine. 



The following formulae are those of the new compounds 

 described in the present memoir. — 



Cespitine 



Chloride of cespityl-ammonium 

 Platinum salt of cespityl-ammonium 

 Bichloride of plato-cespityl-ammonium 

 Chloride of amyl- cespityl-ammonium 

 Chloride of ethyl- cespityl-ammonium 

 Hydrate of ethyl-cespityl-ammonium 



(O 10 H 13 )'"N. 



(C">H 18 )"'HNC1. 



(C 10 H 13 ) r "HNCl,PtC12. 



(CiOHi3)" f PtNCl 2 . 



(C» H 13 )'"C 10 H»Na. 



(C 10 H 13 )'"C 4 H 5 NC1. 



( C io H i3y"c 4 H 5 NQ,HQ. 



Platinum salt of ethyl-cespityl-ammonium . (C 10 H 13 ) '" C 4 H 5 N CI, Pt CP. 

 Bichloride of ethylene- dipicolyl-diammonium (C 12 H 7 ) '" 2 } -«- 3 ni2 



(C 4 H 4 )" j^ 01 - 



XI. On a New Species of Figures of Equilibrium for Revolving 

 Fluids, the particles of which attract one another according to 

 Newton's Theory. By G. R. Dahlander*. 



SUPPOSE a hollow ellipsoid of rotation to revolve round its 

 figure-axis with a constant velocity. Let it be bounded 

 within by another ellipsoid of rotation, concentric with the first 

 one and having the same axis. Around the inner walls there is 

 a fluid, which does not, however, fill up the whole of the hollow 

 ellipsoid, but forms within a cavity round the centre. By attrac- 

 tion and centrifugal force the fluid can, under certain circum- 

 stances, form a figure of equilibrium, which we will now consider. 

 Let the axis of rotation be the z axis of a rectangular coordinate 

 * Communicated by the Author. 



