1 34 Quarterly Horticultural Report. 



the geographical nomenclature of streams. Of the importance of the sub- 

 ject we are well aware, and think it not improbable that it may receive 

 some advancement from the study of the streams falling into the neighbour- 

 ing channel ; in aid of which, the excellent ordnance maps for a square of 

 seventy-two miles, with Bristol as a centre, now at the Institution, may be 

 consulted with advantage. 



We regret that our limits do not permit us to go even more at length 

 into Col. Jackson's paper 5 which, although in some parts open to con- 

 siderable, if not to insurmountable objections, is deserving of all attention. 

 Those who feel interested upon the subject, will find it treated at length 

 in the last number but one of the Geographical Transactions, where also 

 they will find a "Journal of a Voyage up the Massarooney, in 1831 ;" the 

 substance of which was originally read before the Bristol Philosophical 

 Society, at the desire of Mr. Hilhouse, of Demerara, its author. 



QUARTERLY HORTICULTURAL REPORT. 



Rhododendron Arboreum, or. Scarlet Tree Rhododendron, occurs over 

 the mountains of Nipal, where it attains the size of a large forest tree. In 

 this country, though of more diminutive growth, it is as great an acquisi- 

 tion to our gardens as any plant with which we are acquainted, not only 

 from its grand appearance, it producing large heads of flowers of the most 

 intense scarlet hue, but on account of the variety and beauty of the hybrids 

 which have been produced from seed between it and others of the same 

 family, such more particularly as Rhododendron Cataubiense, R. Maxi- 

 mum, and R. Caucasicum. R. Arboreum will not flourish in our grounds, 

 except in very sheltered situations j it has been tried in the Bristol Nur- 

 sery, but without success. It is itself a conservatory plant, but the seed- 

 lings, produced between it and any of the hardy species or varieties, are 

 perfectly hardy. At this time a splendid plant, which was raised from 

 seed saved from R. Arboreum, fertilized by R. Mammum, is in high per- 

 fection at the nursery, and has from forty to fifty large heads of blossom, 

 of a rich crimson. This plant has been out in the American border for 

 these last four years, and has grown luxuriantly. We have also had 

 another fine variety, produced from seed between R. Arboreum and R. 

 Caucasicum, which has flowered this season ; its flowers were large and 

 fine ; and what appears extraordinary, it had two distinct heads of flowers, 

 difl'ering in colour ; the one being a bright rose, and the other almost 

 white. This singular luBus we have never before observed in this tribe, 

 although it frequently occurs in the Camelia and many tribes of plants. 



Camelia Reticulata came into this country from China in 1822, but 

 is not yet common. This fine and very distinct species produces the largest 



