The \vormlillost of these discrepancies, which Ive shall not review, can he understood in t.ernis of differences in ionic strengt.h, molccular \\.eight het,erogeneit'y, arid poorly characterized molecu1;ir \vrtight,s. In many cases, :in excluded volume correction t,o theta solvent conditions lias been attempted, alt,ering t,he riumerical values of 1/x. ncy has been demonstrat,ed betneen the viscosit,y arid city t.heories for this model in a previous publication.6 We do not claim the value of l / h cited in that work is more accurnt,e t.haii other values. In that publication it n-as necessary tlo detcrniine hot.h chain length (molecular wight)) and chain extension (st:Lt,ist.ical lengt,h and eseluded volume). It uxs, however, concluded from hydrodynamics that [)reViOUSly :wept.etl v:diics of t.lie molecular wights of DSA \\-ere too high; t,his coticlusion has tiow h e c~i vcrificd.7-11 Confirni:ition of this prediction t1emonst.r:itc.s t,lir. :itlccluacy \vit,li \vhich t hc \vormlil.rr~ coil model descrilws tlic hytlrotl~~naniic pro1)crt ics of DKA. The intriiisie viscosit,y iititl seclinieiit:ition vc,locitry of D S A c:ui l)otli be tlesci*ihetl b y t,he same basic set o f pnr:imeters I)?. using the \vorniliIic coil model. The compatibility of t,lwst theories has also been cxperimciitally demonstrated for less n-cll charncterized D S A samp1c.s. l 2 , 0 1!)71 I)?. 5o1111 Wilr\. & Si)ii>, l i l t . .