16 BULLETIN 75, U. S. DEPARTMENT OF AGRICULTURE. 
TaBLe VI1.—E fects on seed setting of visits of insects without tripping the alfalfa flower 
at Chico, Cal., 1909. 

Pods set. 
Number 
Description of flowers. Plant. of 
flowers. | Number. | Per cent. 

A 109 3 2.74 
Young flowers untripped and protected from insect visitors. -..| 5 34 0 | 0 
40 1 | 2.5 
A 311 5 1.6 
Old flowers untripped and protected from further insect visitors. p 47 0 0 
33 0 0 
Young flowers developed under natural conditions........-.... B 52 31 59. 61 
Old flowers developed under natural conditions...............- | B 7 18 25.71 



These results indicate that a small percentage of flowers set pods 
without insect visitors and that insect visitors that do not trip the 
flowers have no effect. 
EFFECT OF POLLEN FROM DIFFERENT SOURCES. 
To determine the relative effects of self-pollmation and cross- 
pollination, a series of experiments was conducted at Pullman, Wash., 
Chico, Cal., and New London, Ohio. Using the same female parent, 
pollen was applied to the stigma (a) from the same flower, (6) from 
another flower on the same plant, and (c) from another plant of the 
same variety. The results are presented in Table VIII. 
TaBLeE VIII. —Pods and seeds produced by alfalfa flowers when fertilized by pollen from 
different sources. 
A.—WHEN POLLINATED FROM THE SAME FLOWER. 


Number of seeds. 
Plant Bomber Num- | Flowers 

Locality. Year. | “x 3 ber of | bearmg 
* | flowers. | pods pods Total. | Average 
per pod. 
Per cent 
Chico, al ish <A 08 Mla RR Se BES tele 1909 3399 65 iz 26. ON oes al ee 
Malia ee de 4 ice Soe ew De oe eee 9 1909 5099 95 34 SB e Tile eee Ne i ae ea 
Poliiant Wish Ge ee ee eae oer 1910 il 43 9 20.9 11 1.2 
Ce eee ae ea | Ry ee pea 1910 3 29 2 6.9 2 1.0 
ne PRE ee ORLA Bae ep yc che WEST RED AON Os 1910 5 61 42 68.8 55 tee 
Saas ree as ee Ely UM eee 1910 7 50 19 38.0 34 1.8 
New Meno (OM ena eae acaietuiies a ieee eve 1912 1 33 1 3.0 0 0 
Osa: See eee 1912 2 26 16 61.5 24 35 
SD) Oe ee oe Ge A is Bae es 1912 3 13 0 0 0 0 
(DOSE eee Hees 2k a eee eae ae he 1912 4 27 13 48.1 26 2.0 
ID Yr eS epee Sey varie eit i ase baal ir dnl 1912 5 32 12 357/05) 6 ao 
DY ye Set A? ergs OER Do ae aly 1912 6 39 0 0 0 0 
NGS aba 2 eek OE ete vey on iN as A eel Pov spel 513 PGS a 2a 158, |eck ceeeee 
PASVELASO aa Sone te se ee sateen | Seats time seisien Se widis ats shes |mtelosjacie's B20 1 | ac Comas oe 1.4 


