14 Nebraska Agricultural Exp. Station, Research Bui. 7. 
the family in the garden. The several plants of a family are also 
given individual numbers based upon their position in the row 
and when necessary are marked by means of individual stakes. 
The record card of a family bears, in addition to the family 
number, the family and individual numbers of the selfed parent 
plant or of the two parent plants crossed. Seeds of each indi- 
vidual plant are kept in a separate receptacle bearing the family 
and individual numbers. Records are entered on the family 
cards under individual numbers only. All planting and harvesting 
Fig. 3. — Individual plant-covers of mosquito bar and cheesecloth used to 
protect pole beans from insect pollination. 
of seeds concerned in this study have been done by the writer 
or by assistants under his supervision. 
The records of habit of growth reported here have all been 
made by the writer, who has also made all counts of numbers of 
internodes and all measurements of internode lengths and plant 
heights. The internode counts and measurements were recorded 
in considerable part by Mr. E. R. Ewing, computer in genetic 
investigations. The writer is also indebted to Mr. Ewing for 
the calculation of most of the statistical constants used in this 
paper. Further assistance in checking these calculations has 
