RED-CLOVER SEED PRODUCTION. 13 



Table I. — Treatment of clover blossoms in the artificial manipulation experiments. 



Head. 



Heads not covered with tarlatan. 



Heads covered with 

 tarlatan. 



A . 



Check 





B... 







C 

 D. 



Keel of each flower sprung with a toothpick, care being taken to rub the 

 pollen on each stigma. (A separate toothpick was used for each head.) 





E... 





Check. 



F 







G . 







H 













Table II. — Effect of different types of artificial manipulation upon the seed production 

 of red-clover plants treated in 1911 and 1912. 



25 Selected Representative Plants. 





Numbor of seeds produced 



per head. 



Location, year, and designation of 

 plants. 



Heads not covered with tarlatan. 



Head. 1 



covered with tarlatan. 





A 



B 



C 



D 



E 



F 



G 



H 



Ames, 1911: 



No. 1 



33 



40 

 41) 

 40 

 52 

 54 

 90 

 44 

 47 

 S2 



26 

 46 

 

 69 

 47 

 18 

 33 

 57 

 26 

 55 



30 

 39 

 31 

 20 

 13 

 52 

 43 

 62 

 16 

 59 



47 

 26 

 35 

 36 

 68 

 56 

 69 

 40 

 28 

 65 





 

 

 

 

 2 

 1 

 

 

 





 

 

 

 

 

 

 1 

 

 





 

 

 

 

 

 

 

 

 3 



o 



No. 2 



o 



No. 3 . . 



o 



No. 4 



1 



No. 5 



o 



No. 6 



1 



No. 7 



o 



No. 8 



o 



No. 9 



o 



No. 10 



o 









52.8- 



37.7 



36.5 



47.0 



0.3 



.1 



.3 



9 







Altoona, 1911: 



No. 11 



26 

 10 

 29 

 9 

 22 



13 

 16 



12 

 6 

 18 



24 

 12 

 4 



11 

 28 



5 

 38 



14 

 





 

 

 







1 





 

 

 





 

 1 





 







No. 12 



1 



No. 13 







No. It 







No. 15 













19.2 



12.6 



15. S 



12.8 







.2 



. 2 



.2 







Ames, 1912: 



No. 16 



20 

 33 

 39 

 20 

 44 

 52 

 37 

 40 

 42 

 1.5 



3 

 31 

 45 

 40 

 40 

 61 

 28 

 35 

 28 



5 



25 

 24 

 24 

 28 

 24 

 51 

 33 

 40 

 26 

 6 



15 

 36 

 43 

 21 

 2S 

 52 

 35 

 21 

 43 

 12 





 

 

 

 

 

 

 

 

 





 

 2 

 

 

 

 

 

 

 





 

 

 

 

 1 

 

 

 

 







No. 17... 







No. 18 







No. 19 







No. 20 







No. 21 







No. 22 







No. 2.3 







No. 24 







No. 25 



1 









34.2 



31.6 



28.1 



30.6 







_ 2 



.1 



.1 







Summary of Average Results for the Entire 145 Plants. 



Ames, 1911: 50 plants 



Altoona, 1911: 25 plants. . 

 Ames, 1912: 70 plants 



Average, 145 plants 



44.3 

 16.0 

 48.9 



38.8 



9.4 



42.5 



35.1 

 20.3 

 41.3 



42.3 



isro 



41.5 



0.08 

 .28 

 .1 



0.16 

 .48 

 .1 



0.16 

 .24 

 .14 



41.6 



35.5 



35.5 



37.7 



.12 



.18 



.16 



0.22 

 .36 

 .15 



The average seed yields given in the first part of Table II should 

 be compared with the average seed production shown in the sum- 



