I4G Kei'Ort of the Botanist of the 



GAINS AND LOSSES. 



Rows Rows Rows Rows Rows Rows Rows 



1 and 2. 3 and 4. 5 and 6. 7 and 8. 9 and 10. U and 12. 13 and 14. Tofal. 



Lbs. Lbs. Lbs. Lbs. Lbs. Lbs. Lbs. Lbs. 



Sprayed 22.0 11.6 20.5 11.2 13.9 12.2 19.3 110.7 



Unsprayed 26.5 22.1 81.6 21.4 34.1 25.0 18.1 17S.S 



Total gain 48.5 33.7 52.1 32.6 48.0 37.2 37.4 289.5 



The first section of Table III shows the yield in pounds of each 

 sprayed row, also the total yield of all the sprayed rows before 

 and after spraying, together with the differences of the yields for 

 two years. This table shows a gain from spraying on every row, 

 and a total gain on two-fifths acre of 110.7 lbs., an average gain 

 of 276.7 lbs, per acre. 



The second section shows the yield of each unsprayed row, also 

 total yield, in pounds, of unsprayed rows for two years, together 

 with the difTerences in yield. In every case these unsprayed rows 

 show a decreased yield the second year, a total decrease exceed- 

 ing the total increase of the sprayed rows in a ratio of approxi- 

 mately 3 to 2. 



This method of showing the increased yield from the sprayed 

 row, and the decreased yield from the unsprayed row, does not 

 show the whole advantage of the treatment, at least in the way 

 generally followed. The sum of the increase and decrease as 

 shown in the third section of Table III, comes nearer the method 

 usually adopted. 



By this method the total increase as a result of spraying two- 

 fifths acre will be 289.5 lbs., or at the rate of 723.75 lbs. increase 

 per acre. 



The method usually followed to show the advantages or dis- 

 advantages of any method of treatment is to compare the yield 

 of the treated with that of the untreated for one season, as shown 

 in Table. IV. 



Table IV. — Comparison of Sprayed and Adjacent Unsprayed Itows, 



1900. 



Tol,il 

 Pounds. Pounds. Pounds. Pounds. Pounds. Pounds. Pounds, pounds 



Sprayed rows.. . 115.4 127.0 137.3 125.6 120.8 115.0 134.4 875.5 



Unsprayed rows. 77.9 92.1 79.0 95.1 75.3 85.8 87.3 592.5 



Gain 37.5 34.9 58.3 30.5 45.5 29.2 47.1 283.0 



Percentages .,. 48.0 37.8 74.0 32.0 60.5 34.0 54.0 47.8 



