PERSONAL EQUATION IN BREEDING EXPERIMENTS. 



laboratories have certainly had more extended experience in the 

 din (i and immediate <tudy of plant breeding and of variation 

 in plants (involved in all breeding investigation' than have the 

 oilier observers of the original fifteen. Lists of published pa; 

 could be cited in proof of thi- were it ncce ary, but the tart is 

 obvious. Will this group of workers on problem- of variation 

 and inheritance show a similar d of variability in their 



nits to that brought out in Table \ l.. J 



TABLE VIM. 



IMG THE RANGE OF VARIATI - VI. :> IX 



INCLUSIVE. AND XL TU XI\'. 





li ii from comparison o| thi- table \\ith Table \ I. iliat 



the amount of variation in the -<>,iin- an-1 c-niniiir^ i- di-tincil\ 

 leil-iied in llu- group of student^ o! \.iriatioii. \\lnna- lln- 

 average jierccntage of range in mean ; I ible \ I., ii i- 



bui i).o, or onl\- approximate 1 '.hird a- much, for Table 



\III. Tluis it appears that in tlii- ia-i as \\ould be 



expected on general ground-. 1 experience v pr.nii.-e 



in a particular line -n-.illv re<luce> the per-on.il ei|ii.u ion . 

 It nui>t be said, ho\\e\er, that e\en \\ith the -nuip of ob- 

 servers included in TabK \ 111., the dil'lVrence- are to-. I. 

 in be neglected. When the ran-e <if variation amongsl ilil'ten-nt 

 observers of the >ame thiivj amount- on the a\< approxi- 



