PEDIGREE - CULTURE 5 1 



to be found on p. 230 of my 1906 notebook. At the head 

 of that page is given the pedigree-number of the grandmother 

 as well as the mother, thus "0557.230 Oenothera Lamarck- 

 iana Ser." The maternal year-number, 06, is not necessary 

 here because the entry occurs in the 06 notebook. In tracing 

 out the complete history of the pedigree, I am at once 

 referred by this number to p. 57 of the 05 notebood where I 

 find the data for the parental family with with 04156.57 at 

 the top, indicating that on p. 156 of the 04 note-book will be 

 found the occasional notes on the grand-parental generation. 

 At the top of that page appears the number 030.156 indi- 

 cating that there was no entry in the 03 notebook and that 

 therefore this was the beginning of the culture. In this 

 particular instance there was no 03 notebook since the Station 

 for Experimental Evolution was opened in 1904. 



During the course of each season the pedigree-numbers for 

 that particular year become quite familiar. These familiar 

 numbers are carried along on the seed-bag and on the labels 

 in the seed-pans, as a sort of introduction to the new family. 

 Thus in the seed-pan from which the 06230 plants mentioned 

 above were taken, appeared the label 0557.230 just as it did 

 in the note-book. The characteristics of the 0557 family are 

 still fresh in mind and serve as a key to the new family, 

 without always needing to refer back to the records. On 

 removing the plants from the seed-pans to pots, each must 

 have its individual label. The new family has become 

 established in the mind of the operator, and much labor is 

 saved in the writing of labels by dropping the grand-parental 

 number and prefixing the year-number to that part of the 

 former number following the period, thus resulting in the 

 "06230" first introduced above by way of example. 



In keeping of notes it will have been already observed 

 that I enter all the data concerning the members of any fam- 

 ily on one page of my note-book. These notes are entered in 

 chronological order and dated. Whenever an individual is ob- 

 served which varies in any notable way a parenthetical number 



