172 »uuih;m.\n. 



Mmmakv 



l\v (ho omploN u\on( of a now motho^l, by whioli tho rosistaiuv is 

 luoasimHl sintultniuHHisly for a hoavy dinvt oiirivnt aiul a small supor- 

 {Hv^oil aUornatiui: ounvut of a«.\nis(ioal frtHiuouoy. iloviatious from 

 Ohin'vS law at hijjh ounvnt donsitios havo boon dotivt^nl and nioav^^urtnl 

 in loaf i::v>Kl and silvor. Tho uiaximum ounvi\t donsitios woro about 

 r> \ 10" «'up ^''^^'' '*''^^ *^^^' doviations fwm (.'•hni's law woiv of tho 

 onlor of ono por ivi\t. If (l»o nuvhanism of c\Muluotion is a froo path 

 mivhai\ism. thoso ri^sults prv^bably moan that tho froo patli is nmoh 

 U^n^^T than snppvv*tHl on tho olassioal oUvti\>n thix»ry. 



It is a ploasnrt^ to aoki\owK\lct' nty indobtixlnoss to my assistant 

 Mr. «1. C Slator for n\akinv: noarly all tho rt\»dinj::s. 



1 J. .1. ri»oT\tsvM\. Tho iVrpusovUtjr Thtvrv vM Mattor. l^H^T. p. oo. 



a iMork MawvoU, .1, H, Kvon^tt. A. Sohvistor. Brit Asi:oo. Kop. 1S70. otH>3. 



S F. Wonuor. rUvj*. Kov. oJ^ lo. :>;ii >>;vj. UV.XV 



4 K. l.<vhor. Sitjlvr. Wion. Akad. IU»-'* I, 4«MV. UXK. 



5 H. K, Yv>n IVtuilvnlvrs:. rh\->!- Z8. IS. To-TS. H)17. 

 e J. r.Httorv\>n. Phil. M,s»i. 4. tv\2-<>7S, UXVJ. 



: W. R Ot. 8\vann. ^hil.^l;^>i. JS. U>: 4VHv 1914. 



^ r W". l^rivi^iitnan. rivv^ Kov, i>. Jl^iWJSi). 1917, and 17. UU-liM. 1921. 



H.srN~>;rvi ruivorsitv, 0;uubrids?\ Mas?, 



