COBN BREEDING 149 



Silks. 



(9} Provided any corn in silldng stage is available. 



(qJ With a magnifying glass examine the fresh silk sticking 

 out beyond the shuek for hair-like branches and for 

 poUen grains that have lodged on the silk. 



(6) Tie large, strong paper bags over several young ear- 

 shoots before any sUks appear. 



(c) A few days after the silks appear under the bags, note 



how much longer thej^ are than silks which have re- 

 ceived poUen. 



(d) While the silks under one bag are still fresh, and before 



any pollen has reached them, cut all the silks on one 

 side of the ear, just inside the shuek ; apply corn 

 poUen on the remaining silks. In three weeks note the 

 number of grains of corn developed on each side of the 

 injured ear. 



LiTEEATTJEE 



East,E.:M. Conn. (State) Expr. Sta.,Rpt. 1907-1908, Part VII, 



p. 41, and Conn. (State) Expr. Sta., Bui. Xo. 1.58. 

 Smith, L. H. 111. Expr. Sta., Bui. Xos. 128 and 132. 

 Williams, C. G. Ohio Expr. Sta., Circ. Xo. 71. 

 Hartley, C. P. U. S. Dept. Agr., Farmer's Bui. Xo. 229. 

 SouLE, A. M., and Vaxatter, P. 0. Va. Expr. Sta., Bui. Xo. 



16.0. 

 Davexport, E. The Principles of Breeding. Xew York, 1907. 

 Davenport, E. 111. Expr. Sta., Bui. Xo 119 and Circ. Xo 101. 

 Webber, H. .1. Plant Breeding. Bailey's Cyclo. Agr., Vol. II, 



pp. 53-69 ; and Xenia (double fertilization), U. S. Dept. 



Agr., Div. Veg. Phys. and Path., Bui. Xo. 22. 



