J. U. H. FIaldank :]or) 



In pnictict». howowr. «iwiii^ U* thi? n>(i«lity of tho rhn»iii<>H4iiiic, tla* 

 vahif of c, thiiH cnU'uluUHl in tini Hinull. ami thonr of r„, r,, «•!<-. 14h» lar>(«'. 

 They art* howi-vor inon* JMXMimU* for ^wnl lrIl^al^s. whin- tin- n^uUly 

 of the clm>iu<woint>.M atT«TU ihc n'.suh.M t«» a Ivhh ixtmt. 



It in suggtNsUHl that tht* unit (»i'(iiMt.;iiKM> in n chrniiioHdiiK' im difiiH d 

 above bi* lA'niuKl a " inorpm,' on thf analogy of th«« ohm. voli, ,'\r. 

 Mor^iiH unit of ilistjuico is thrn*fon; a ct-ntimor^an. 



To obtain a morf acounitr rrlation Iwtwrrn .r and y >%•• may ph»t 

 the curvi\H n^prfstiitin^' (Mjuations (2) and {'\), ami th«n nbt-iin •in 

 piric^illy a curvo lyini^ iK'twcm thr two which Ht.s the ol)s«'rv«d pmuIIh 

 a« closfl y JUS |x»ssihl('. This ha,s hr«'n d«»m' in thr fii^urt', whrn- lim- («/) 

 ri»piv.s*'nLs r«niation C2). t-urvc (/>) i'<|uation {'A), and curv** (/•) 



•'• = ■"//- .', >«»Kr(l-2//) (.'»). 



K<{uation (">) is nu'ivly choson to ^ivc* Jis ^o«m1 a fit as )Hi.ssihh' 

 juid h.'is pn»bably n«» theoretical significance. Tlie |M»ints repnsmtin^ 

 observations an- plotted ;us follows: 



The values of y in columns 2 and '.) of Table I are t^ik»*n, and tin* 

 corn."s|H)nding dist-:inces in mort^ans (values of./) read otf from curvr (c) 

 or Table II. which is c^vlculaLed from ecpiation (5). These latter are 

 addtnl together, and a {x)int plotted with their sum .-is absciss^i and the 

 observed cross-over value from column' 7 of Tal)le I :us ordinate. For 

 example the first row of Table I gives the following result: 



The cross-over values '+12 and "2'M) correspond, according t<» th<* 

 curve (c), or better, by interpolation from Table II, to distances of •.■>4*J 

 an<l '261 morgans respectively. The sum of these distances is •SK), and 

 the obsi'rved cro.ss-over value from column 7 is '400. The point farthest 

 t<i the right is accordingly plotted with abscis.sa <S1() and ordinate MA). 

 Curve (c) gives the value 479 f(»r //, and the error «»f // is aco'idinglv 

 •019, or 19 /,. 



It will be seen that IS of the observati(»ns lie above tli<' curve (r), 

 18 below, and that in only 4 cases, 3 of which an- among the it>uli.s 

 <pierie<i in Table I, does the error of ?/ ixceed 04 or 4 , . The pioliable 

 error of the cross-over values, ;us calculated from the curve, is I .S . nr. 

 omitting the (puriejl result.s. !(> /, . This result is not large cniiMderJUL,' 

 the probiible err«u-s of the values of// f<»r the points plotted, which raiiL^t 

 from 81 °/ downwards. 



The curve gives s;itisf;ict.<»ry H'sults f«>r smaller cr<»ss-nV(r Nahn-s. but 

 these are not ph»tted. ;is they do not allow of much di^criminalinu Im - 



Joam. of Gen. viii -'1 



