148 JOUKNAL OF THE EOYAL HORTICULTURAL SOCIETY. 



from northern Pines at Mariabrunn (his station) remained behind those 

 from the middle European trees.* 



M. v. Sivers found that in the Baltic provinces the seedlings of Baltic 

 Pinus sylvestris grew into finer-stemmed trees than those which sprang 

 from Darmstadt seed.t 



Dr. H. Mayri found that Norwegian and Finland Scotch Fir 

 (P. sylvestris) were able to resist the severe climate of their homes better 

 than either Riga or Darmstadt seedlings. 



Dr. P. Scholt,§ on the strength of many experiments, decides that the 

 local race of Scotch Fir is probably the best suited to its own climate. 

 That is clearly the obvious logical deduction from all the preceding 

 experiments. It is fully borne out by those conducted by Professor 

 Engler. 



Perhaps the most lucid and instructive detail which appears from the 

 latter's numerous experiments is this : Seedlings from very high altitudes 

 on the mountains begin their growth in spring a little before, and shed 

 their leaves a very long time before, seedlings of trees in lower altitudes. 

 It, of course, follows from this that at low altitudes the offspring of 

 lowland trees have a very much longer time to grow, and are much taller 

 and more vigorous than their neighbours whose parents dwell high up in 

 the mountains. 



Thus from the tables we find the following details, which are illustrated 

 by photographs and diagrams in the original paper : 



When Picea excelsa was planted at the Adlisberg (670 metres or 2,200 

 feet altitude), seedlings of which the seeds were obtained from trees at 

 Lenzerheide (1,550 metres or 5,052 feet altitude), and from the Engadine 

 (1,N00 metres or 5,886 feet altitude), began their growth a week before the 

 offspring of trees of Winterthur (545 metres or 1,767 feet), Adlisberg or 

 Pilatus (1,000 metres or 3,270 feet altitude), but they stopped growing 

 from a fortnight to six weeks before these latter. 



To take one or two typical cases : Engadine and Lenzerheide seedlings 

 in 1902 began their growth on April 17, and stopped on July 1 and 

 June 20 respectively. The Adlisberg seedlings began on April 28 and did 

 not stop till August 12. 



Similarly with the Larch (four-year-old seedlings). When planted at 

 Adlisberg (670 metres), the offspring of Ponte trees (2,100 metres or 

 6,867 feet altitude) began on May 18 and stopped growing on July 2. 

 Those, however, whose seed was gathered at Bonaduz (700 metres or 

 2,289 feet altitude) began on May 24 and ended on August 18. 



So also with Sycamore (Acer pseudoplatanus). Seeds gathered at 

 Alp Drusen (1,600 metres or 5,232 feet) began in 1904 to bud on May 2 

 at Adlisberg, and had lost their leaves on October 8. But seeds gathered 

 near Adlisberg itself began on April 15, and did not shed their leaves till 

 October 24 ! This probably explains why it is that the annual growth in 

 length was found to be so much greater when the seed was obtained at 



* Centrdlblatt fUr das gesamte Forshcesen, 1887, p. 149 ; 1895, p. 7 ; 1899, p. 49. 

 f Forstw. Centralblatt, 1898, p. 537 ; Mitthcil. d. dcut. dendrolog. Ges., Poppelsdorf , 

 1895, p. 49. 



% Allgem. Forst- und Jagdztg. 1900, p. 81. 

 § Forstw. Centralblatt, 1904, p. 123. 



