in Hybridisation 63 



This experiment was made in precisely the same way as 

 the previous one. Among all the experiments it demanded 

 the most time and trouble. From 24 hybrids 687 seeds 

 were obtained in all : these were all either spotted, grey- 

 brown or grey- green, round or angular*. From these in 

 the following year 639 plants fruited, and, as further 

 investigation showed, there were among them : 



8 plants ABC. 22 plants ABCc. 45 plants ABbCc. 



The whole expression contains 27 terms. Of these 8 

 are constant in all characters, and each appears on the 

 average 10 times ; 12 are constant in two characters, and 

 hybrid in the third; each appears on the average 19 times ; 

 6 are constant in one character and hybrid in the other 

 two ; each appears on the average 43 times. One form 

 appears 78 times and is hybrid in all of the characters. 

 The ratios 10, 19, 43, 78 agree so closely with the ratios 

 10, 20, 40, 80, or 1, 2, 4, 8, that this last undoubtedly 

 represents the true value. 



The development of the hybrids when the original 



* [Note that Mendel does not state the cotyledon-colour of the 

 first crosses in this case ; for as the coats were thick, it could not 

 have been seen without opening or peeling the seeds.] 



