HEREDITY AND FORESTRY. 7 



The Swiss Forest Department has also experimented with larch 

 (crop 1900), and the main results are brought together in Table 

 IV. In the first place, attention may be called to the general 

 tendency for high-grown seed to produce short plants, though it 

 must also be noted that this result was not observable until the 

 parent trees had stood at an altitude of some 6000 feet. 



Table IV. 



Swiss Experiments with Larch Seed {Crop 1900) 

 in Nursery at Adlisberg {2200 feet). 



Several trees. 



Besides this character of high-grown seed, the Table also shows 

 that the four-year-old larches varied to some extent as regards 

 the date when they came into leaf, the plants from high-grown 

 seed becoming green some days before the others. But much 

 more striking was the period when growth ceased for the season, 

 this occurring in the end of June or early in July for the plants 

 raised from high-grown seed, but not till well into August in the 

 case of the plants from low-grown seed. The growing season 

 was thus a month to six weeks shorter in the former case than 

 in the latter. Needless to say, these results have an important 

 bearing on the liability of plants to be affected by late and early 

 frosts, a form of injury to which the larch is specially subject. 



Finally, a few of the results obtained with the sycamore in the 

 Swiss experiments have been brought together in Table V. 

 These plants were raised from seed sown in 1901, and when 



