428 Description of a Pit for Forcing. 



sound ; the straw has been renewed twice during that period, 

 and some repairs have been given for the third time this season. 

 I have thehonour to remain, 

 Sir, 



very respectfully, 



your obedient humble Servant, 



Alexander Stewart. 



Valleyjield, Perthshire, 

 February 23, 1826. 



Explanation of the Figures. 

 Fig. 1. A section of the pit with the cover lowered. 

 Fig. 2. A section of the pit with the cover elevated by the tilt, 

 Fig. 3. A perspective view of a part of the pit. 



