376 71. AMENTIFER.E. 



forth, must be understood to be drawn out from the pub- 

 lished records and my own notes about Quercus Robur, 

 sometimes distinguished from Q. sessiliflora, sometimes not 

 so distinguished. In other words, it is the distiibution of 

 Quercus Robur (Q. pedunculata) more or less confused 

 with Q. sessiliflora. Dr. Dickie mentions the oak as high 

 as 1500 feet in Aberdeenshire, "on steep rocks above Pan- 

 nanick Wells, on the south side of the Dee, about one mile 

 and a half below Ballater ;" but he was not quite certain 

 about the species. I have myself not seen either of the 

 oaks above 1000 or 1100 feet in Scotland. 



988, c. Quercus sessiliflora, Salish. 

 988, b. Quercus intermedia, Don. 



Area 1 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17. 



South limit in Devon, Isle of Wight, Kent. 



North limit in Sutherland (Dr. G. Johnston). 



Estimate of provinces 17. Estimate of counties 70. 



Latitude 50 — 59. British type of distribution. 



Agrarian region. Inferagrarian — Superagrarian zones. 



Descends to the coast level, in the Peninsula. 



Ascends to .? (300 yards .?). 



Range of mean annual temperature 51 — 46. 



Native. Sylvestral, &c. It is remarkable to find so 

 much uncertainty in the opinions of botanists on important 

 points relating to our British oaks. First, are there one or 

 two (or even three) species ? Secondly, what is the true 

 distribution of each species, real or supposed, apart from 

 the other or others ? Thirdly, which of them yields the 

 best timber ? These queries have not yet been replied to 

 with certainty or unanimity. It would seem, however, that 

 Q. sessiliflora was once the most generally distributed in 



