American Pomological Congress.— The next 

 session of this National Institution, which was to 

 have been held in September, is hereby postponed 

 to the 2d, 3d, and 4th days of October next. 



The Ohio State Board of Agriculture have also 

 postponed the State Fair to the same time. In 

 conformity, tliereforo, with ihe Resolutions, in- 

 structing the President of this Association to act 

 in concert with that Board, this notice is given to 

 countermand the Circular issued for the meeting 

 in September. 



'1 lie reasons assigned for this change are, that 

 the apprehensions in relatinn to chnlera and simi- 

 lar diseases may continue to exist imtil after the 

 time heretofore ap]iointed for the meetins of these 

 Institutions. Marshall P. Wilder. President. 

 Boston, August 22. 1850. 



The Pennsylvania Horticultural Society 

 will hold its Twenty-second Exhibition on 

 Wednesday, Thursday and Friday, the 18ih, I'Jtli 

 and 20th of September, in the Philadelphia Muse- 

 um, corner of Ninth and George Streets, and will 

 occupy the Two Grand Saloons of that building, 

 which will afford ample space for the most exten- 

 sive display of objects in horticuliure, etc. 



bena, called Onion Jack — flowers and umbels 

 medium size ; color, strong carmine, becoming 

 darker at the base of the petals, with a distinct 

 light ej'C. Although it will not rank so high as 

 either of the three already mentioned, it is never- 

 theless a very desirable one. A Subscriber. 

 Boston, July 16, 18.50. 



The New Verbenas. — I see in the last num- 

 ber (July) of the Horticulturist, an article from 

 "Looker-on." Speaking of the fine things he saw at 

 the Boston Horticultural exhibition, he says: " the 

 novelties that attracted most attention were Mr. 

 Barnes' new French Verbenas, and Col. Wilder's 

 seedling Calceolarias. The Verbenas were Iplii- 

 gene and Reine de Jour, both remarkably fine and 

 distinct," &c. " Looker-on" should look on more 

 carefully; the two fine Verbenas above referred 

 to, are not Mr. Barnes'; he had not in his posses- 

 sion the Reine du* Jour at the time "Looker-on " 

 wrote his article. These fine Verbenas, to which 

 another, perhaps equally as fine, should be added, 

 the Saint Margaret, were brought to this country 

 last season, — the Iphigene and Reine du Jour, 

 from Paris, and the Saint Margaret from England, 

 by Jas. Jackon, of Boston. 



Mr. Jackson has in bloom another French Ver- 



* I have seen this Verbena written several limes de ; it is 

 Mol coErect ; k should be du. 



Virtues of Spent Tan. — Permit me, as an 

 addenda to my exjicriments with spent tan, as re- 

 corded in the July No., to meniion another case 

 of equally great value, and wliicii must, I trust, 

 put a qnietus upon those merely theoretical talk- 

 ers upon hoi ticultural subjects, who have de- 

 nounced it as po sonous, ust-less, Stc.. &e. 



In May last, I lrans|ilanted a large number of 

 recentiv imported dwarf pears, many of which 

 were verv di_v. but by care, and good mulching 

 with l.an, I Inncieil I should save them all. One, 

 however, in particular, a three year old, about the 

 latter part of June, after a faint elfort to burst it.s 

 buds, gave up in despair. On cutting it down, a 

 slight evidence of vitality appeared in the stock, 

 at ten inches from the ground. This I enclosed 

 by a box frame twelve inches square, and the 

 same in depth, and filled it with fresh tan, i. e., 

 tan fresh from the vat, leaving the stock pro- 

 truding through the Ian an inch. A fortnight since 

 a party of horticuliurai friends made me <a call, 

 among whom was Col. B. Hodge, of the Buffalo 

 nurserv. Tiie virtues of spent tan were mention- 

 ed, when I determined to test this experiment in 

 their presence. 



Upon examininnf the dead and blackened stock, 

 as protruding through the tan-bark, it was decided, 

 ncm. con., that in this case it must ]irove a failure. 

 Not so. however, for upon carefully removing the 

 frame and tan to the proper surface, eight blanch- 

 ed but thrifty shoots were discovered, varying from 

 a half to an inch and a half in length ! ! Without 

 permitting their exposure too long to a strong 

 light, and drying wind, I replaced the empty 

 frame, covered by a light of glass, and spread 

 some grass over the surface to check the intensity 

 of the sun's rays. By this progressive hardening 

 they have now assumed a rich green color, and a 

 growth of some six inches, bidding fair to make 

 one of the handsomest trees in my grounds. 



