PREFACE, 5? 



Thefe and fuch-like confiderations induced 

 me to make trial of feveral experiments, among 

 which were the following : 



Of rotten dung I made a ridge or bed two 

 feet broad, thirty inches high, and as long as 

 the frames which were intended to be fet upon 

 it. On each fide of this ridge I made up a 

 lining of good warm dung, raifing it higher 

 than the ridge of rotten dung on account of 

 its finking; after that the frames and lights 

 were fet upon it, and managed in all other 

 refpe^ls as a common dung-bed. 



Another experiment which I made trial of 

 was upon an old well-fettled dung cucumber 

 bed, in which I made holes here and there to 

 enable the heat of the linings to warm the air in 

 the frames. 



A third experiment which I tried was with 

 green turfs, which I had cut handfomely, and 

 with them I built up the fides of the bed 

 cleverly, leaving and making vacuities for the 

 circulation of the fleam of the linings among the 

 turfs and underneath the mould in the frames. 

 Thefe three methods anfwered pretty well, but 

 they were only the prelude or leading to a better 

 and more durable plan ; for I thought of having 

 a bed built of bricks ; and, to be fliort> I 

 fchemed out a plan, and got it executedo 



A 4 Tn 



