S. (\ IIaui.ani) IIT) 



viMibIc owr thr whole tvMtn, ju* in tin* Solid ty|K's. In this jMirticiihir 

 cr<»«s, f«>r rxiiiiiplo. it i** otTtJiiu thai at Inixt iIuim- ditVonnf slmdrs of 

 bi-own ti))|H>nr in Kj, but owin^ to ihr (lifKnilty o| chiKsifyin^' iircnrahly, 

 the browns hav»» all Ikhui placed in oin- vIohh. 



Brown-eye ran Ih* deserihcd as a brown with a lainl piirpir cast. 

 The cohair of R^mI is nither \u\\rr than that of the vaii^ty \{t'i\ Kipp« r. 

 which is cIjussihI by ( '. V. ri|x'r (lfM2) jis maroon. Pi|M'r stat<'s that 

 undiT th<' kjronp of pink seeded varieties is a nin^j* of colours fioin 

 viniuxHuia to brick re<l. When the |H'as an- a^ed thcne colours darken 

 so that they aix' v(Mt difficult to distiui^niish from maroon. In this 

 IMijX'r the c«>lour of the variety Rod will he described as red. It must 

 b<' underst^MHl that the results which an' h<'re described apply (»ni\ to 

 this imrticular cross. It is certain that th«' relations of the test.a 

 coloui's in cow|H';us are far from simple, and th(^ workint( out ot all (jI 

 them would Iv a task of no mean magnitude. 



The Kvpentnental Results. 



The plantsS of the F^ showed complete dominance of brown, but it 

 was n<n possible to tell whether the particular shade of brown of the F^ 

 wjia the .s;ime ;us that of the brown eye parent. 



The F,^ 



The results of the F., are presented in Table XVI. Segregation 

 iKx^urred into (a) browns of various shades, (b) dark maroon, difficult to 

 distinguish from black when quite ripe, (c) a maroon less intense in 

 colour, (d) red of the same shade as the red parent. 



The plants were classified into three groups, brown, maroon, and 

 red. The ratio between brown, maroon and red was near to 1 2 : .'-J : I. 

 The ratio of brown and maroon to red was 18'2 : 10. 



It may be concluded that two facto i-s are concerned, M pioducing 

 the maroon colour, and N producing the brown colour. N is (Inminaiit 

 over M an<l the tyjies appearing in Fo will be as follows: 



f) N M Brown. 

 .S N m Brown. 

 .S n M Maroon. 

 1 nm Red. 



The various shades ot brown and maroon may perhaps be accounted 

 for by iissuming that the het«'rozygot«'s aic dit!'<'rent in appearance from 

 the pure lyiKs. 



In onler to contirm this hyjKttlusis a laim- nunibe?- (•! families were 

 grown in F,. 



.Tourn, of (ien. viii S 



