planes of clivision occur may indicate variations in the process 
of segregation.^) 
3. We do not yet know whether independent reduplicated 
Systems can be formed in the same individual. In the Sweet 
pea for instance we have not yet seen the conseqiiences of com- 
bining blue^ erect Standard^ and long pollen with the Fertile- 
sterile^ Dark-light axil series, and much may be discovered when 
such families come to be examined. 
Animals. 
The phenomena seen in animals may well be produced by 
the segmentations in which the parts of the ovary or testis are 
determined. Hitherto no case of coupling has been found in 
animals. Among the phenomena of repulsion however, of which 
many examples exist, certain suspicious cases have been observed 
which may mean that in animals reduplicated Systems exist like 
those of the plants. Nevertheless at present it seems not impos- 
sible that the two forms of life are really distinguished from each 
other in these respects. 
Terminology 
Lastly, in view of what we now know, it is obvions that the 
terms ,,coupling^^ and ^^repulsion^^ are misnomers. „Coupling" 
was lirst introduced to denote the association of special factors, 
while ^^rcpulsion^^ was used to describe the dissociation of special 
factors. Now that both phenomena are seen to be caused not by 
any association or dissociation, but by the development of certain 
cells in excess, those expressions must lapse. It is likely that 
terms indicative of differential multiplication or proliferation will 
be most appropriate. At the present state of the enquiry we 
hesitate to suggest such terms, but the various Systems may con- 
veniently be referred to as examples of reduplication, by 
whatever means the numerical composition of the gametic series 
may be produced. 
1) c. f. Coulter and C h a m b e rl ai n, Morpliology of Angiosperms 
1903, p. 187. 
