ON POTATO- GRAFTING. 



85 



Plot 3. Similar to plot 2. 



Plot 4. These were more compact in growth than those in 

 plot 1, and about on an equality as regards the production 

 of flowers. 



Plot 5. In August these plants were the most stocky in growth 

 and the most freely flowered; they were, on the whole, 

 considerably more floriferous than the rest, with the excep- 

 tion of those in plot 6. In September the plants of A were 

 nearly exhausted as to blossoms through the whole six lots, 

 whilst those of B, evidently a later sort, were just coming 

 into good bloom, and producing finer flower-trusses than 

 those in plots 1, 2, 3, 4. 

 Plot 6. Not appreciably different from plot 5. 

 It would thus appear that, in general terms, the unmanured 

 soil, and the soils prepared respectively with a mixture of am- 

 monia and mineral manures, and with a mixture of nitrate of 

 soda and mineral manures, gave the best results, whilst the 

 results in the cases of the soils prepared respectively with the mi- 

 neral mixture only, and with the ammouia only, were the least 

 encouraging, and that wherein it was treated with nitrate of 

 soda alone gave the least development, and seemed to favour com- 

 pactness of growth. 



It is proposed another season to extend the experiments over a 

 larger area, adopting pot-culture of the plants (grown in dupli- 

 cate) as admitting of an earlier commencement being made — 

 namely, at the period of the first spring shift, when but little de- 

 velopment has taken place, and also as permitting of a greater 

 variety of treatment within possible limits. 



XX. On the Result of Experiments in Potato -grafting. 

 By M. Fenn. 



I grafted this year Red Ashleaf on Dickson's Premier, Pater - 

 son's Scotch Blue on Royal Albert, and vice versa. I have been 

 unfortunate this season in regard to the taking of the grafts. I 

 planted and kept the grafted sets in 6-inch pots, contrary to my 

 later practice of planting them in the open ground when the shoots 

 in the pots have pushed 5 or 6 inches out of the soil. This may 

 have tended to cause non- success as regards the cicatrization of 

 the skins ; nevertheless sufficient results have been arrived at to 

 afford conclusive evidence as to the possibility of grafting one po- 



