EXPERIMENTS WITH POTATOES. 153 



as these cases go, they seem to indicate that spraying with Bor- 

 deaux mixture not only prolonged the life of the vines, but that 

 sprayed potatoes contained higher percentages of starch than 

 unsprayed. 



The results of a single experiment at Kalmaes Agricultural 

 College, Norway, gave results indicating a very beneficial influ- 

 ence from Bordeaux mixture, both in yield and in starch con- 

 tent of the potatoes grown. The condensed results were as 

 follows :* 



% 



Potatoes not treated witl) Bordeaux niixtnie 1,426 13.9 



Potatoes treated once "witli Bordeaux mixture 2,116 14.3 



Potatoes treated twice "with Bordeaux mixture 2,S.",8 i 16.3 



THE STARCH CONTENT OF AROOSTOOK GROWN POTATOES COM- 

 PARED WITH THAT OF POTATOES GROWN ELSEWHERE. 



The sixteen samples here reported upon were found to carry 

 an average of 18.29 per cent of starch. The percentages ranged 

 from 15.96 to 20.38 per cent. Two of the samples carried about 

 16 per cent, two about 17, two about 19 and two about 20 per 

 cent. The other samples had about 18 per cent. The eight 

 sprayed samples had an average of 19.06 per cent and the un- 

 sprayed had an average of 17.43 PS'' cent of starch. It is prolD- 

 able that the crop of 1898 did not average much above that of the 

 unsprayed samples here reported upon. 



In 1890, the Utah Experiment Stationf made sixteen analyses 

 of potatoes in which the starch ran abnormally high. In 1894 and 

 1895, the same station made about seventy-five analyses in which 

 the starch content varied from a minimum of 10.17 P^r cent to 

 a maximum of 22.49, with an average of about 17 per cent. 



The analyses of something over 200 samples of potatoes by 

 the West Virginia Experiment Station! show a range in starch 

 from 13.46 per cent to 21.43 per cent. Only four of the ramples 



* Experiment Station Recorfl, Vol. S, p. 122. 



t Report of Utah Experiment Station for 1S06, pp. 21 to 2.5. 



X Report of West Vijginia Experiment Station, 1S96, pp. 50-57 



lO 



