AGRICULTURAL EXPERIMENT SATATION. 57 



General Summary. 



1. The evidence at hand indicates that within certain limits 

 there is an immediate influence of pollen on the mother plant; 

 but that these limits are quite restricted. 



2. The most important plants showing, unmistakably, 

 immediate efifects of foreign pollen are the pea, the kidney 

 bean and the Indian corn. It is possible that the orange may 

 be included in this list. 



3. Sweet corn shows the eflfect of foreign pollen more fre- 

 quently than do the other races of corn 



4. Cucurbitaceous and solanaceous plants have not been 

 found to exhibit immediate eflfects of pollen. 



5. Rosaceous plants are in dispute, but the weight of 

 authority would indicate an absence of immediate efiect. 



6. The theory of the double action of pollen— stimulating 

 as well as fertilizing— as suggested by Naudin and Focke, 

 seems plausible; but in some species the ovary will develop 

 in the entire absence of pollen. 



7. The most important examples of agamic development of 

 fruit, are seen in the Egg Plant— *S'oZa?iM??i melongena—and the 

 English forcing cucumber — Cucumis sativus. 



8. In no instance, when pollen is witheld, are perfect seeds 

 developed. 



9. There appears to be no relation between the amount of 

 pollen produced by a plant and the amount required for 

 fecundation. 



10. There appears to be no relation between the amount of 

 pollen produced by a plant and the number of seeds produced 

 by its fruits. 



11. The amount of pollen applied may in many cases be of 

 great practical importance in determining the form and size 

 as well as the quantity of the fruit produced. 



12. The amount of fruit produced by certain varieties of 

 strawberries appears to vary, in some instances, with the 

 amount of pollen supplied by the variety used as a fertilizer; 

 but this occurrence is not universal. 



13. The form and size of tomato fruits are directly 

 dependent on the amount of pollen furnished, — asmall amount 

 invariably resulting in small and deformed frmt. 



