EXPERIMENTS WITH REFERENCE TO THE POTATO DISEASE. 59 



expected that the plants would be destroyed where touched by 

 this strongest application ; but the experiment was made in order 

 to ascertain whether or not the whole plant would be destroyed ; 

 and if not, whether the roots would send up fresh shoots. In a 

 few hours after the application, the foliage was mostly decom- 

 posed ; the peduncles and young fructification entirely so. The 

 calyces were reddened ; and likewise in some instances the folia- 

 ceous decurreiice along the angles of the stems. The stems a 

 little under and a little above the surface of the ground were 

 tinged of a bright crimson colour. The foliage changed first 

 to a foxy brown, bleaching to a dull white next day. On the 

 third day after the application it was observed that the por- 

 tions of stems which were crimson-coloured in the first instance 

 had clianged to a dull white, the external tissue being decom- 

 posed. Where the decomposition extended on the stem below 

 the surface of the ground, a fungus of a bluish-green colour 

 began to make its appearance. The stems above ground were, 

 in short, all destroyed. A few sprung afi'esh from below the 

 surface. When taken up, September 24th, the amount of sound 

 produce estimated per acre was 1 ton 93 lbs. There were no 

 diseased tubers. 



Table V. — Results of Experiments with Cornish Kidney, Early Manly, 

 and Early Champion Potatoes, planted 7 inches deep, in the Kitchen 

 Garden, in rows 2 feet 4 inches apart, and 8 inches from plant to plant in 

 the rows ; cut Tubers employed for Sets. Results 1 to 14 are each from 

 22 feet of i-ow; 15 and 16 from 50 feet. 



Weight I Weight 



Estimated Rate of Produce 

 per Acre. 



Sate 

 . irCent. 

 Diseased, i Diseased. 



1. — Cornish Kidney. 



Sulphuric acid, 1 to IS^watnr 



, , 1 to as , , 



,, 1 to 50 ,, 



,, 1 to 100 ,, 



1 to 150 ,, 



1 to 200 



Pints. I lbs. 02. lbs. oz. 



Nothins 



2. — Earf.y Manly. 



Sulphate of magnesia , 



Chloride of lime 



Nothing , 



3. — Early Champion. 

 Five rows, each 10 feet in length, 



plants tupped May 17th . . . 

 iFive rows, each 10 feet in length, 



plants not topped 



Tons.cHt.lbs 



1 93 



19 99 



6 10 29 



7 12 58 



8 11 98 



9 9 44 

 11 18 71 





 5 



14 



1 1 

 1 6 

 1 2 



4 2 96 



7 19 10 



8 2 45 

 8 17 9 



10 2 20 

 8 2 98 

 18 I 8 13 86 



0-00 

 000 

 3-84 

 8-78 

 11'19 

 12'28 

 8-65 



1-13 

 0-00 

 4-19 

 4-27 

 0-23 

 1'96 

 3-24 



5 7 11 1 1 



2 10 S ' 11 7 6 



1 3 37 ; 9-56 

 1 14 111 13-35 



