A Letter from Sir Dudley Cullum toJohn Evelyn, Esq; concerning the lately in-vented Stove for the Preservation of tenderPlants and Trees in the Green-house du-ring Winter ; formerly publish'd in the Phi-losophical Transactions, Vol. xviii. Num.212. Page ipi.

SIR, ^

I Cannot but think my self obliged in Gratitude to give you an Ac*count how well your lately invented Stove for a Green-house suc-ceeds (by the Experiment I have had of it) which certainly has morePerfection than ever yet Art was before Master of. Sir,' I have purlu’dyour Directions in laying my Pipes ( made of Crucible Earth ) not toonear the Fire-grate, which is nigh upon, or better, than sixteen Inches •and by making a Trench the whole length of my House, under the Pa-ving (for the Air to issue out and blow the Fire) of a convenientbreadth and depth (that is, Eighteen Inches both ways, cover'd withan Arch of Bricks) and at the oth^r End of the Trench, having a squareIron Plate answerable to that of my Paving ( which is Eighteen Inches)to take off and put on, with a round Hole at the Corner, of aboutthree Inches diameter, with a Lid to slide open, and lhut, upon everyEnd of them, as you may have seen upon some Porridge-Pot Covers-ib that by opening any of these Holes, or all of them, more or less ortaking off the whole Plate, I can release such a quantity of Air out ofthe House to blow the Fire so, as to increaseor diminish the Blasts- andas you werepleas’d by Letter to inform me, concerning distributing theAir at its Admission more equally thro' the House, I have inserted myPipes into a Channel all along the Wall, at the end of the House withthole several Overtures you mention’d. All which, Sir, I assure youprove most admirably well: And by which free and generous Commu-nication of yours, you have most highly oblig'd all the Lovers of thisHortulan Curiosity and Recreation, as well as,

SIR,

N Tour most Faithful and

Humble Servant,