Observations on growing Timler, 43 1 



^, s, d, •>*/r. :ry- j^, s, d» 



2 3 6 Accumulating as 'kbove for >50 



years, will amount to - 24 



; Add the value of the tree to be cut 



down at the end of 200 years 2 3 6 



Total amount in 200 years — 3,592 3 6 



And carrying forward this calcu- 

 lation, the total amount of the 

 produce in 300 years t\ould 

 amount to — i^". 4 72,408 



In former times, when the value of oak-woods was 

 eitimaied by the number of hogs their acorns would fat- 

 ten, the greai age of trees would be of small consideration; 

 but in the present limes, I am persuaded, that if gentlemen 

 who have many. trees standing of the age of 150 years and * 

 upwards, would give this subject its due consideration, 

 they will be aware of the immense loss to which they are 

 voluntarily subjecting themselves. — And this great loss is 

 much to be regretted, in a political point of view, espe- 

 cially as the produce of this island is insufficient for its 

 necessary consumption. 



My motives for troubling you with this hasty production 

 are, to promote the good of the public, bv endeavouring 

 to persuade gentlemen to bring forward well ascertained 

 facts, respectmg the most profitable management of grow- 

 ing timber trees, and to induce them to mvestigate, with 

 accuracy, this very curious and, important subject. If you 

 think it is likely to have those effects, I shall thank you to 

 lay this paper before the Society of Arts, &c. for their 

 consideration. 



I am, sir, your obedient servant, 



No. 99, High Hc.lborn, ChARLES WaISTELL. 



Oct. 1809. 



LXIV. A List of about Five Huiidred Collieries in and near- 

 to Derbyshire, By Mr, John Farey, Mineraiogicfll 



. Surveyor. 



To Mr. Tilloch, 



Sir, X INCLOSE a list, of such collieries as I have either 

 visited or obtained information concerning, in the course 

 of my recent examination *of the county of Derby, and the 

 borders of the seven adjacent counties. Should you deem 



the 



