Horticultural Register. 603 



portion of old roots ; by which practice the vine fills its pot with new 

 roots every year. He attends to them well with water during the whole 

 time of forcing (of course when the fruit begins to ripen they are allowed 

 much less) ; they appear to answer well, either on spur or single rods, and 

 when any one becomes weakly from over-bearing, it is cut down nearly 

 close to the pot, and allowed a year's rest." 



Art. 2. Remarks on Harrison and Curtis's New Mode of Glazing. 

 By Joseph Paxton, F.H.S., Gardener and Forester to his Grace the Duke 

 of Devonshire, and one of the Conductors of this Magazine. This mode 

 " consists, ' when complete,' in having one plane surface, and no projecting 

 part above the glass, except the collars and small heads of screws employed 

 at the angles to fasten down the squares. 



" Having had some frames constructed for His Grace the Duke of De- 

 vonshire, we are enabled to give an accurate description of the mode, as 

 well as to state our decided approval of the system, as far as we are at 

 present able to judge." 



This mode of glazing is too imperfectly described to enable us to give a 

 clearer idea of it than what the above extract conveys, without recurring 

 to the specification in the Patent Office, which we shall by and by do. We 

 shall only further add, that it is founded on a mode of forming plate glass 

 windows without asti'agals, invented by John Robinson, Esq., Edinburgh, 

 and shortly described and figured in the Gardener^ s Magazine , vol. iv. p. 178. 

 We have our doubts as to how far it may be found eligible with common 

 glass and common hot-houses ; but, nevertheless, we are happy to see it 

 brought forward, and trust it will receive a fair trial. We recommend it 

 to the notice of the Birmingham hot-house builders, who, we think, are the 

 most likely to be able to try it on a large scale. 



Art. 3. On changing the Colour of the Flowers of the Hydrangea 

 hortensis. By Rusticus. Struck with the vigorous and healthy state of 

 some hydrangeas, kept by some cottagers, whose flowers were blue, the 

 writer enquired what compost they were potted in, and was told sandy 

 loam, mixed with about one third of fresh sheep's dung. The plants are 

 watered with the same material in mixture, and the effect is always blue 

 flowers. 



Art. 4. Arboriculture. On the Neglect of Forest Planting in Great 

 Britain. By Quercus. [E. Murphy, Esq.] The author endeavours to 

 direct the attention of gardeners and others to the science of arboriculture, 

 quoting what is said by Sir H. Steuart as to the ignorance of gardeners on 

 the subject. 



Art. 5. On retarding the Blooming Season of the common French 

 and English Roses. By Mr. J. Hayward. Delay pruning tUl the buds 

 have pushed half an inch or more in length, and then shorten below where 

 the buds have pushed, that the lower buds, previously dormant, may be 

 excited. 



Part H. Horticultural and Rural Subjects, consists of extracts from 

 the Gardener's Magazine for June, The Alemoirs of the Caledonian Horticul- 

 tural Society, British Farmer's Magazine, Quarterly Journal of Agriculture, 

 and from the botanical periodicals. 



Part in. Natural History. Original Communications. Art. 1. Some 

 circumstances connected with the Natural History of the Goat Moth 

 (Cossus ligniperda). By Edward Murphy, Esq., Agent to the Horticultural 

 and Arboricultural Societies of Ireland. The technical history of the 

 insect is compiled from Kirby and Spence, and from Lyonnet. The 

 additional circumstances inform us that the caterpillars or larvae of this 

 moth have committed considerable devastation* on some trees in the 



* Dendrophagi (tree-eaters) is an expressive, and to us original, term used 

 l)y Mr. Murphy for the insects which prey upon trees. A knowledge of these 



