128 Method adopted hy 'Robert Turner^ Esq.^ 



all the water down the centre of the squares. By this it will be 

 seen that the joinings, or laps, thus channeled and cemented, 

 instead of being the weakest and most liable to crack, become 

 the strongest part of the quarry, and act like so many cross 

 bars to strengthen the body of the glass. In the Encydopccdia 

 of Gardening, there are eleven cuts, and nearly three pages of 

 letterpress, on popular systems of glazing, adapted to all grades, 

 from the one-light box glazed with fragments, to the productions 

 of architectural talent where the patent sash-bar is glazed with 

 plate glass and Stewart's copper lap, forming princely con- 

 servatories, adapted to the culture of the lofty banana. Yet, 

 notwithstanding this patronage, and your high encomiums on the 

 copper-lap glazing with a hole in the centre, I beg leave to 

 differ in opinion, and that for the following reasons: — When a 

 temperature of 70° (with moisture, and occasionally smoke) has 

 to be maintained in a stove, whilst the thermometer ranges about 

 midway between the freezing point and zero, all ingress and 

 egress, either through lap-holes or loopholes are outof the question. 

 The least hole, or even crack, in a hot-house roof is certainly 

 injurious in the culture of exotics; a few drops of water, drifted 

 in during a storm, often destroy bunches of grapes. Besides, 

 hot air being of less specific gravity than cold, naturally seeks a 

 higher level through every cranny; and it is a small cranny in- 

 deed through which this subtle element will not pass. Yet, in 

 the face of all this, there are unobservers who prefer open un- 

 puttied laps, and holes at the lower corners of their peaked 

 squares ; not calculating on the impossibility of maintaining 

 artificial summer weather under a hot-house roof with holes in 

 it, on a windy wintry night. I have had to maintain high tem- 

 peratures in stoves constructed with metallic roofs, and peaked 

 panes of glass with Stewart's lap and opening ; and 1 have also 

 had to maintain it in stoves roofed with closely puttied laps of 

 glass, wooden sash-frames, and cast-iron rafters. In the former 

 case, unwearied attention could not even come near the desired 

 end ; for no sooner was a genial moist heat raised, than it es- 

 caped through holes and crannies ; and, in the latter, it was 

 maintained with accuracy and comparative ease. 

 Alderley, Chester, Oct. 19. 1837. 



Art. VI. Minutes on the Method adopted by Robert Turner^ Esq., 

 Surveyor of the Nexu Forest, in raising and protecting Oak Plant- 

 ations. By T. Davies of Warminster, and Y. Sturge of Bristol. 



The New Forest contains about 66,000 acres, of which about 

 one half is, more or less, covered with timber. The officers are 

 called on to supply 500 loads per annum of oak timber to the 

 royal dockyards ; besides which, about 200 loads are yearly 

 felled for other purposes. Hence are also supplied very extensive 



