I fear that some misunderstanding has arisen regarding the prize I offer for 20 Diosoorea Batatas. I distinctly stated that it should be given for the best 20 roots from sets not weighing more than 1 oz., and planted in the spring of 1858. I have heard that several parties intend to put in competition roots from sets planted the year previous; if allowed to do so my object will be entirely defeated. Bo we plant Potatoes, Carrots, Parsnips, or any other like vegetable to remain two years before being dug up for use? I want to have practical illustrations of my theory that this Tarn will do in almost all soils, provided there is sufficient depth. My experience is that wherever Carrots succeed the Yam will also thrive, and I am sure that it would be a profitable crop. All we have to do is to convince the public that it is a first-class vegetable, and create a demand for it; but I invariably find more difficulty in persuading people to purchase anything new in the culinary department, than in any other branch of our business. - James Cutbush, Highgatt Nurseries, Nov. 2.