I. Inheritance in Shirleij Poppy 61 



III. Dis-ovarial syniinthic i'xhom()tro])y * aA .hA 



„ dianthic exhomotropy aA . hA' 



„ synanthic exonclotropy aA' .LA' 



„ dianthic exendotiopy aA' . bA 



„ dysanthic hypermetatn^py aB . hA 



„ dysanthic inesonietatropy aB . hA' 



„ dysanthic hcini-hyporinetatropy uB.hC 



„ dysanthic pronK'tatropy aB' .hA' 



„ dysanthic hemi-prometatropy aB' .hC 



„ synanthic exotropy aO . hC 



„ dianthic exotropy aO . bC 



It will tlins be seen that tliere are 33 different f'orms of sibling relationship in 

 plants corresponding to whole or half'-brotherhood in hoises, dogs or inen; and 

 further for a particular plant grown as a crop, although the nature of the plant 

 may enable us to cancel certain of these relationships as impossible, there will 

 generally be a considerable number left, and the proportions of each class niay be 

 quite uuknown to us. For exainple, if we take seed from the same capsule 

 on a plant whose flowers are capable of either cross- or self-fertilisation we niay 

 really have a niixture of nine differe-nt types of relationship owing to poUen from 

 the antliers of the same flower, from anthers of other flowers of the same ])lant, and 

 from anthers of flowers of different plants being scattered on or carried by insects 

 to the same stigma or sj'stem of Stigmata. Hence it is very difficult to compare 

 the relationship of the bisexual offspring of some aniraalsf, or even of the 

 parthenogenetic offspring of certain insects with the relationship among offspring, 

 which may ränge all the way from aB . aC to aA . aA in unknown proportions ;[:. 



* While in every case the names lead to the same relationship symbolically expressed, the symbol 

 may lead us to differeut names for the same relationship. Thus dis-ovarial synanthic exhomotropy = 

 dis-ovarial synanthic hemi-hypermetatnipy, etc., etc. We have reserved, however, the metatropic termin- 

 ology for those special endotropic and exotropic relationships which cannot be expressed witbout it. 



t Similar relations to those of plants may occur in animals liaving a repetition of gonads ; but such 

 animals have not yet beeu investigated from the Standpoint of heredity, so that no comparison with our 

 plant results is possible. 



X If the individiial flower, as is occasionally the case, possesses a System of ovaries or sub-ovaries 

 (flj, u„, «3, ,,.) and these are assooiated with individual Systems of anthers (.-(j, A„, A^, ...) then the 

 System of relationships beoomes still more complex and breaks up in the case of seed from the same flower 

 head alone into the 37 types : 



_ S"i^i •"i-'^i' «i'-'i •"i-'^i; a^A^.a„A^; a^A^.a^A„; aj.-li . n.^.Jj ; a^A.^.a^A.^; 

 \aiA,^.a„A-^\ a-^A„.a^A^; a^A^.a^A^; a^A^^a^A^; a^A^.a„A^; 

 aA.aA' =aj.4j . Oj^j'; aj.d2.a1.i1'; a^Ai.a„Ai'; a^A^.a.^-^ \ a^A^.a^A^ ; 

 aA' .aA' =a^A^' .a^A^ \ a^A^.n„A^; a^A-^' .a^A.,' ; a^A^'.a„A^; 

 aA' .aA" — a^A-^ , a-^A^' 'j a^Ai . a.^A^' \ 



aA.aB =a^A^.a^B^; a^A^.a-^B^; a^A-^.a.Ji^; a^A„.a.Ji^\ a^i^-a^B^; 

 aA' .aB =aiA^ .a-Ji^; n^A^' .a.Ji-^\ 



aB.aB =a^B^.a^B^; a^Bi-a^B.,; a^B^. a.^B^; «iBi.floBj; 

 aB.aB' ^a^B^.a^B^' ; a,ß, .«jßi'; 

 aB.aC =a^Bi.aiC^; ajßi.a.,Ci. 



