( 484 ) 



No^v let lis ('((iisidrr only wlial lia|>|)ens fVn' flio \a'^oniotoi' nerves. 

 If these are exeitcMJ hv fVef|iieiit shocks ol' the iiidiiced ciin-eiil. ihev 

 rcact bv a vasocoiistrietlo]! followed l)v \ asixhlalatioii. If iho shocks 

 of the furreiil are followinü one aiiothei- very slowly, oidy dilatation 

 is obtained. And finally, if a peripherieal motor nerve inner- 

 vating both striped ninscle-tibres and vasenlar ninseles, is stimulated, 

 it may oeenr sometimes, that after one single shoek of the cnrrent 

 only contraction of the volnntary libres follows. If several elementary 

 stimuli, IbUowing one another in an a[)pro|)riate rhythm, are applied, 

 first a contraction of the stripetl muscles, may be obserxed, next of 

 the vasoconstrictor, and tinally of the \ asodilalator libres. 



As soon as we suppose in the retina or in the >kin the presence 

 of more than one species of end-organs the possibility may i)e 

 assumed that only one of these species reacts on stimuli of short 

 duration, whilst other oi-gans react on stimuli of longer duration. 

 If stimnli of definite duration and intensity are made use of, both 

 organs will reaet, each after its own latent period, in the same 

 way as happens foi- muscles, vasoconstrictors and vasodilatators, .so 

 that we will obiaiii two sensations subseipient to each othei'. In 

 cases, where three excitable organs coexist, even three separate 

 sensations may l)e felt, as in the case of stimulation of the skin 

 and of the retina. 



Chemistry. — '^TIk' cmirsr of the soluliilitii currr in thr nujion <>f 

 critical ti'in jn'rahii'fs oj' hnnirij nn.rtiii ,-.■<. (Second communica- 

 tion). By Dr. A. S.mits. (Oommumcated by Prof H. W. IJAKuns 



ROOZKBOOM. 



(Commuiiicatt'd in the meeting ut December I'J, l'J03). 



In my preceding commnnication '; on this subject I have repre- 

 sented iji the figures 3 and 4 the /;-r-secl ions for dilfereut temperatures, 

 starting with the critical temperature of J and finishing at the melting 

 point of J). Fig. 3 holds for the case thai the three-phase-curve 

 lies entirely below the [)laitpoint-cnrve, and Fig. 4 a])i)lied to the 

 case that the three-phase-cur\e cuts the plaitpoint-curve. In order 

 to ol)tain tlie T-.v- projection tVom the combination of the different 

 /;-.i'- sections, the variations of pressure were left out of account. 



To complete what j)recedes the actual succession of the y^-.f-sections 

 for different temperatures will be represented here. 



1) These Proc. Oct. 27th 1003, p. 171. 



