It seems that most florists and gardeners do not know how plants get burnt through the sun. Mr. Peter Henderson, even, advises in his pamphlet, "Greenhouse Structures," to throw away all glass having flaws, etc. I never found burnt leaves from such glass. All burns I found to come when water lodges between the laps, which will make a focus when the sun strikes it on the right angle. Such panes of glass do not lay tight enough on each other, hence the blistering water is held there. Such laps should be filled with putty.

[Mr. Geduldig is probably correct in his judgment. The writer of this has hitherto believed with Mr. Henderson and others, that some defect in the glass has caused the blistering; yet he has often endeavored to trace the relation between these burnt leaves with the ideal "blister in the glass," without success. Moreover, he has seen leaves of camellias and callas badly burned in some seasons, pass through without the slightest injury in others, though placed in the identical places - which could hardly be, if the same burning blisters in the glass were there. There may be variation in the quantity or condition of water between the laps, while the glass itself will remain the same. - Ed. G. M.]