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AMERICAN JOURNAL OF BOTANY 
[Vol. io, 
fective in any way physiologically, and there need be no discrimination 
against such tubers for seed purposes, although such discrimination has 
been customary. In fact, the experiments of Dr. Salaman (4) in England 
showed that knobby second growths planted as seed-pieces produced a 
larger crop than pieces from normal tubers, and that the tendency to second 
growth was not transmitted. This suggests another question, then, as to 
the advisability of submitting to critical tests some current ideas concerning 
standards of quality in Irish potatoes, at least from the standpoint of 
seed growing and plant improvement. 
LITERATURE CITED 
1. Dudley, J. E., and Wilson, H. F. Combat potato leafhopper with Bordeaux. Wis. 
Agr. Exp. Sta. Bull. 334. Pp. 31, 18 figs. 1921. 
2. Duggar, B. M., and Bonns, W„ W. The effect of Bordeaux mixture on the rate of 
transpiration. Ann. Mo. Bot. Gard. 5: 153-176. PI. 10. 1918. 
3. Erwin, A. T. Bordeaux spray for tip burn and early blight of potatoes. Iowa Agr. 
Exp. Sta. Bull. 171: 63-75. 2 Pis. 1917. 
4. Salaman, R. N. The influence of size and character of seed on the yield of potatoes. 
Jour. Min. Agric. London 28: 43-48. 1921. 
