536 Forestry Quarterly. 



This was all planted, natural regeneration not being practiced 

 here. 



The greatest loss occurred toward the end of the season when, 

 late in August and in September cold and even frosty nights 

 began to intervene between the severely hot days. Dry cold 

 weather and wide differences between day and night temperatures 

 have previously proven especially harmful to spruce and White 

 Pine in their first summer. 



In point of relative drought resistance the species planted here 

 stood as follows : The most resistant first : Oak, Scotch Pine, 

 European Larch, Norway Spruce, White Pine (strobus). Some 

 Japanese Larch had been planted and these were all killed. On 

 the other hand the green or Colorado variety of the Douglas Fir 

 withstood the drought quite well. Beech occurs here only as an 

 underwood and suffered practically no damage. No Scotch Pine 

 over twelve years was killed but Spruce up to fifteen years and 

 even older was killed in some places. The greatest loss occurred 

 in conifers from two to eight years old, that is to say, before the 

 crown cover was established. Besides trees killed outright many 

 have been weakened and are falling prey to insects and fungi so 

 that they must scyon be removed. 



On the basis of his observations the author lays down the fol- 

 lowing principle : 



Practical procedure is properly based on the weather of ordi- 

 nary or normal seasons and not on exceptional years either good 

 or bad. This region is undoubtedly the driest in all Germany but 

 the season of 191 1 has never been paralleled in the memory of 

 man. 



The current practice of planting in furrows well cleared of 

 grass and weeds shows no need for improvement. Grass is 

 especially harmful to young plantations by depriving the trees of 

 a large part of the soil moisture, and through its evaporation, by 

 cooling the air more rapidly and so favoring frost. The whole 

 result is that the closing of the crown cover is delayed and the 

 stand is longer exposed to injury. Cultivation of the whole area 

 would undoubtedly be still better but at present the necessary 

 labor is not available. 



Mixture of broadleaf and coniferous species is worthy of fur- 

 ther trial. 



