SOME REMARKS ON BRITISH FOREST HISTORY. 1 67 



30. Gross, Gild Merchant. 



31. Hume Brown, Early Travellers in Scotland. 



32. Acts of Parliament of Scotland. 



33. Travels of Nica?ider Nucius (Camden Society). 



34. Pollard, Tudor Tracts. 



35. Debat des Heraulx, Pyne's translation in England and 



France in the Fifteenth Century. 



23. Petawawa Experiment Forest Station. 



By James Kay. 



The experiment station of Petawawa was established in 1918 

 under the auspices of the " Honorary Council of Scientific and 

 Industrial Research." 



The work to a certain extent is similar to that of the Swedish 

 Forest Experiment Station which, since its foundation in 1902, 

 has given considerable time to the establishment and revision 

 of permanent sample plots on forest types and stands of 

 different ages. 



These are of two kinds : " Detached Plots," which were during 

 the first " two-year periods " lightly thinned, but later more 

 heavily, or which were from the start thinned heavily either 

 from above or from under ; and " Serial Plots," laid out bordering 

 on each other in the same stand and thinned according to 

 different strength and different methods. 



The objects of the experiments are : — 

 (i) To ascertain what influence thinnings have on the incre- 

 ment of the whole stand and the different stem classes, 

 or the individual trees ; 



(2) To show when the increment of the stand begins to decline, 



and when the growth of the individual tree reaches it 

 climax ; 



(3) To study the effect of thinning on the condition and 



character of soil and ground cover. 



The sample plots were a little less than an acre in extent, and 

 square or rectangular in form. It was difficult to get an exact 

 acre representative of average conditions, but the sample plots 

 or their different sections should not be less than half an acre in 

 extent. Belts 15 to 45 feet wide are laid out surrounding the 



