RED-CLOVER SEED PRODUCTION. 13 
TasieE I.—Treatment of clover blossoms in the artificial manipulation experiments. 
Heads covered with 
~ Head. Heads not covered with tarlatan. : 
tarlatan. 
CARs 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.) 
D....| Tapped several times with coarse toothbrush....._......-.-..-..----..-- 
Ieee | Pree a seep ee eye aie ee Se hee. ark se wie ciate Warnemem see e Siler: Check. 
eras eee darn e pace oaths OO Sekt te ks Beate hehe eee ee oe ee Worked sameas B. 
(Cypeaerae | eae ae ae a p ae  E  a oak eee pee eR A Worked same as C. 
TOES te ete C8 Dt ee Le ee RHO OR RE ee Sol eek ole BiG tar Why Worked sameas D. 
Tas.e Il.—Effect of different types of artificial manipulation upon the seed production 
of red-clover plants treated in 1911 and 1912. 
25 SELECTED REPRESENTATIVE PLANTS. 
Number of seeds produced per head. 
Location, year, and designation of Heads not covered with tarlatan. | Heads covered with tarlatan. 
plants. 
A B C D EK F G II 
Ames, 1911: ’ 
IN@s dogse ses Rae eae ea eects 33 26 30 47 0 0 0 0 
INO} DSSS SEs Sic ter ee Ne 40 46 39 26 0 0 0 0 
INGn-Oe. Sa eee ae soe eee eae ae pee 46 0 31 35 0 0 0 0 
TNO ie Se oe eee a 40 69 20 36 0 0 0 1 
INOS DSR Re ee Cs aie oe eee ane ae 52 47 13 68 0 0 0 0 
INORG Reeser ne Se 54 18 52 56 2 0 0 1 
INYO i si es ee i ee ene 90 33 43 69 1 0 0 0 
INO SEs ese eee oe Se eee 44 57 62 40 0 1 0 0 
INGO SONS re oe Cpe ey ene 47 26 16 28 0 0 0 0 
ING OES oe ee ae ee eres ee 82 55 59 65 0 0 3 > 0 
PARV CR ACCS eit iat = ies jae pat 52.8 37.7 36.5 47.0 0.3 1 3 2 
Altoona, 1911: . k 
IN (Qe P ys ie i oie eee 26 13 24 5 0 1 0 0 
NEO IR TA oe g res 10 16 12 38 0 0 0 1 
INTs Beet See aes ears enue ee a 29 12 4 7 = 0 0 1 0 
INQ POT AS eco erm SIE ee ieee 9 6 ll + 14 0 0 0 0 
INOS Os aie ae ee eee ee 22 15 28° 0 0 0 0 0 
SAV CTA SOR: secs <a isn ois See 19. 2 12.6 15.8 12.8 0 2 2 2 
Ames, 1912: 
ING Sa GUE ose sa eee ee 20 3 25 15 0 0 0 0 
TNS EN Nas sie a Sieg ae 33 31 24 36 0 0 0 0 
IN(OWUIS Beate econ Sy I Gees ey 39 45 24 43 0 2 0 0 
INGBIO: Gidos ae SSGeE aon Soe: 20 40 28 21 0 0 0 0 
INO PAO) ae es Serco eg ea 44 40 24 28 0 0 0 0 
INO. Ci eee eee ree 52 61 51 52 0 0 1 0 
ING), PO eee eS eat oy See ae 37 28 33 35 0 0 0 0 
INIQs Ps see eae 2s Ae ee 40 35 40 21 0 0 0 0 
INO) LS eas Ane oy ane a epee ge 42 28 26 43 0 0 0 0 
INO Se rae es ic eae RT VE 15 5 6 12 0 0 0 1 
PAW TOR AP Osean esos sok Soar Efe ee 34. 2 31.6 28.1 30. 6 0 2 il 1 
~ SUMMARY OF AVERAGE RESULTS FOR THE ENTIRE 145 PLANTs. 
Ames 191 50 plants .22522--s--2--- 44.3 38.8 35. 1 42.3 0. 08 0. 16 0. 16 0. 22 
Altoona, 1911: 25 plants........-...-- 16. 0 9. 4 20. 3 18. 0 . 28 . 48 . 24 . 36 
Ames, 1912: 70 plants........---.--.- 48. 9 42. 5 41.3 41.5 1 1 14 15 
Average, 145 plants......--..-- 41.6 35. 5 35. 5 37.7 .12 .18 . 16 oi 
The average seed yields given in the first part of Table II should 
be compared with the average seed production shown in the sum- 
