A quantitative Study of Variation, Natural and Induced, etc. 209 
many ways essentially like that of variations coming from seed. The 
inherited variations that were found have all but one concerned 
characters that mendelize in sexual reproduction, and as there is no 
evidence upon the inheritence of the one exception, it may be left 
out of consideration .... It follows that segregation may occur in 
the somatic cells, and that by division of one of these somatic cells 
a line of descendants originates lacking a Mendelian character that 
is present in the parent cell. The fact does not develope anything 
new in regard to the relative importance of the chromosomes and 
the cytoplasm as bearers of hereditary characters, but it certainly 
seems to show that Mendelian segregation is not limited to the 
reduction division in the maturation of sexual cells.” 
If bud variation and seedling variation may be treated as ana- 
logous the measurement of one should be as important as the mea- 
surement of the other. In fact it seems that greater care should be 
exercised in distinguishing the one from the other. It seems quite 
certain that what is in fact due to bud variation is often listed as 
due to seedling variation. 
It is an easy matter to note the extent of bud variation when 
the plant is reproduced by vegetative parts, but it is more difficult 
when sexually produced seeds are used in reproduction. Which is to 
say that differences in seedlings may be due to bud variation on the 
mother plant, but owing to the fact that the reduction division pro- 
cesses have since taken place we are prone to list these differences 
as seedling variations. Suppose, however, that all of the seedlings 
from one bud (capsule) vary about a certain mean and that seedlings 
from another bud (capsule) vary about a different mean. Have we 
not in such a case an evidence of bud variation on the mother plant 
carried forward by means of sexually produced seeds? A study based 
on this hypothesis is here reported. 
It was stated in ‘‘Materials and Methods’ of this paper that six 
self fertilized capsules were collected from each of the three mother 
plants, 250—II, 250—12, and 250—13. The pure lines produced 
from these six capsules of each mother plant offer instructive data 
regarding the extent of bud variation on said mother plants. A com- 
parison of the constants is the method used for the interpretation 
of the facts. 
Induktive Abstammungs- und Vererbungslehre. IV, 14 
