( 1'^^ ) 



coiu-se quite possible lluil in otiiei- j)hu'es a diflei-ent species of ant 

 takes over the function of Jri(loit)//)'nie.r. 



The ants have been determined by professor Forkl. through the 

 intervention of Mr. Jacobson ; professor Fohi<:i, further states, that 

 this species of ant inhabits in large numbers the tubers of Mipine- 

 codia and HiidnopJitjtiun, a fact which we onrselves could observe 

 in phxnts from Tjihitjap and nuitenzorg. Another species of A'syV^/^/^/, 

 namely D. siujlttata Decaisne, which we found in large numbers on 

 Hibiscus tiUaceus on the sea shore at Koeripan, germinates and grows 

 on the trees in our garden more readily than the two otliei- S|)ecies. 

 So far we could not find here any trace of myrmecophilous disse- 

 mination. In addition to theii- i)eing distributed by ants, the three 

 D/sr/udia's Jiiffdcsiain/, codt/iis and nuiiinruhiria agree with one 

 another in a \arie1y of other points. We hope to be able to show 

 this later. 



Physics. —- "/.sv>///('/'//'.s' of moiKitoiiiic suhshdiCi's and of thcii- hiiKirij 

 ini.i'tarcs. X. The hclmviour of (tiytni. iridi n'sjx'i-t to do- /aw 

 (f conrspoiu/iin/ sfftlcs." (Conlinucd). l>y l*rof 11. K aimkrlinoh 

 OnM":s and C A. ('uom.mkmn. ('omm. N". 121 '' tVom the 

 Physical LaboratoiN at Leiden. 



/ 



(Communicaloil in tlie incrlin^- of May 27, 11)11). 



§ 4. Corn/)((risoii if niyon. isutheniis icilli diosc ohtdiiiad from, die 

 iDCdii reduced equation of state, and with those for isopentane. 



Two tables which we have already |)ublislied, one of them ') 

 containing the individual virial coefficients for argon calculated from 

 the experimental results, and the other') the corresponding coefficients 

 deduced from the mean reduced equation of state VI 1. 1 afford, on 

 conq)arison with each other, a means of deteiinining the behaxiour 

 of argon with respect to the law of corresponding states. Of this 

 behaviour, which finds expression in systematic deviations from VII. 1 

 we have tried in Plate I to give a comprehensive representation 

 which seems to us a suitable manner of giving striking expression 

 to the characteristic deviation of the reduced equation of state for 

 the monatomic substance argon from the reduced mean equation for 



') Proc. Ac. Amslc'ulam, Dec. 191U. Comm. N". 11S6 Table II. 

 ~) Proc. Ac. Anislei'daai, March l'.)li. Cuinia. N*^. 12()c/ Table 1. 



