OTHER MENDELIAN CHARACTERS 23 



fruit on the top of the branches, and they are 

 esteemed and taken for Scottish Peason, which is 

 not very common." The fasciated variety now 

 exists under the name Mummy Pea. What this 

 name means I do not know. Many people imagine 

 that these peas are found in Egyptian tombs. 



Mendel crossed a variety characterised by a 

 fasciated stem, with a variety the stem of which was 

 normal; and found that the stem of the resultant 

 hybrid was normal.* The second hybrid generation 

 consisted of 651 normal, and 207 fasciated plants. 

 Only a hundred of these 651 normal plants were 

 tested to see if they were pure or hybrid normals. 

 Ten seeds of each of the hundred were sown, as in 

 the case of the tall and dwarf character. The 

 oifspring of thirty-three of the hundred were normal 

 without exception. Of the offspring of the remain- 

 ing sixty-seven, on the other hand, some were 

 normal and some fasciated in the case of every 

 plant — as close an approximation to the expected 

 Mendelian ratio as can be obtained. In other 

 words, of every three normals in the second hybrid 

 generation two on the average were hybrid and one 

 was pure. 



We have so far dealt with characters of the stem 

 of the plant ; first, with the differences in the length 

 of the internodes which produce tall and dwarf stems, 

 and then with the differences in the arrangement of 



* Particulars as to how to procure varieties which exhibit the characters 

 studied by Mendel are given on page 158. 



