The fourth exhibition of the season was held in the Surrey Zoological Gardens on the 25th of July. The day was somewhat unfavourable, and consequently there was a comparatively thin attendance. The exhibition itself was a very good one. The first tent we entered was filled with stove and greenhouse plants from Messrs. Bruce, Cole, Hamp, Pamplin, and Pawley, and we are glad to record that they were all in capital condition for the season of the year. On one side of this tent were arranged the Carnations and Picotees, the show of which was large and fine. The new mode of shewing them on boxes of a uniform size, and on cards, had a decidedly good effect. Coming so soon as this exhibition did after the Slough show, we deem it unnecessary to do more on this occasion than to give the names of the winners; for to name the flowers would be travelling over the same ground twice, and we have neither time nor room for that. The prizes were awarded as follows: -

Carnations, 24 blooms. Nurserymen: 1st, Mr. Turner; 2d, Mr. Bragg; 3d, Mr. Ward; and 4th, Mr. Willmer. Amateurs: 1st, Mr. Edwards; 2d, Mr. Newhall; and 3d, Mr. Perkins.

Picotees, 24 blooms. Nurserymen: 1st, Mr. Turner; 2d, Mr. Norman; 3d, Mr. Bragg; and 4th, Mr. Ward. Amateurs: 1st, Mr. Lockner; 2d, Mr. Perkins; 3d, Mr. Newhall; 4th, Mr. Edwards; and 5th, Mr. Pond. - Mr. Edwards' prize for the best six yellow-ground Picotees was awarded to Mr. Norman.

Seedling Carnations, 1st class certificate to M. May, Esq., for Glendower, crimson bizarre; also to the same, for Falconbridge, pink bizarre.

Seedling Picotees, Mr. Turner obtained 1st class certificates, for Burrousrhes' Duchess of Sutherland; ditto, for Burroughes' Lorina; ditto, for Turner's Lady Harriet Moore. Mr. Norman received a certificate for Prince Alfred, heavy purple. Mr. Newhall exhibited a heavy purple-edged flower, and Mr. Edwards a very shewy heavy scarlet edge, - both good, and deserving certificates, but did not obtain them. The Woolwich Cup, open to Amateurs only, for twelve Picotees, was awarded to Mr. May, for twelve beautifully grown flowers, mostly of that gentleman's own raising.

One side of the next tent was occupied by Cape Heaths, from Messrs. Fairbairn, May, Williams, Cole, Leach, Smith, Pamplin, and Pawley; and there were also some admirable specimen Heaths from the same growers. The next side of this tent was chiefly filled with Fuchsias, some of which were superb specimens. They were trained to single stems, the lateral shoots being allowed to diverge gracefully from them; they formed beautiful pyramids of blossom, from six to nine feet high! This mode of training is, we think, decidedly the best for Fuchsias in pots. Mr. Shuckford of Stockwell sent the plants to which we have just alluded.

Mr. Smith of Hornsey shewed a promising seedling Fuchsia, named Kossuth, with crimson finely expanding calyx and violet corolla; and Mr. Kendall of Stoke Newington had three seedlings, one named Emperor, a large bold dark-flowered sort, and two named Elizabeth and Mont Blanc, with light calices and violet corollas: of these Elizabeth is the best.

Spikes of Hollyhocks were produced by Mr. Chater, and most excellent spikes they were. So closely were they ornamented with flowers, that some even expressed an opinion that they owed more to art than to nature. But that was not the case; and we were pleased to see that, by means of skill and perseverance, a great improvement has at last been effected in this fine flower. We remarked a beautiful collection of Verbenas, in pots, from Mr. Ivery of Peckham. They were all nice sorts; but the point to winch we are desirous of drawing attention to at present was, the way in which they were trained, which was on horizontal circular wire trellises fixed round the tops of the pots. Cultivated in this way they looked uncommonly well. Cut flowers and Roses were largely exhibited, and there were some nice Petunias and Antirrhinums. Mr. Wood of Norwood had some Alpines and variegated plants.