DAMAGE DONE. 



663 



Thus Hellmann, considering danger for the beech from 



lightning as 1, gives 



Conifers 



Oaks. 



Other broadleaved trees 

 Cohn Oaks 



Poplars . 

 Caspary Oaks . 



Poplars 



15 



54 



40 



14 1 out of 40 trees 



12 j" struck. 



15 1 out of 93 trees 



341" struck. 



C. Hess (1896) found that pyramidal poplar is often struck, 

 and that in eight out of the ten cases he observed lightning 

 passed from the tree to a neighbouring building. Poplars should, 

 therefore, not be too near to buildings. 



According to Collodon, near the lake of Geneva, poplars 

 rarely suffer from lightning. 



In the " Eevue des Eaux et Forets,"* the results are given 

 of 15 years' experience in a forest composed as follows : 



Percentage of trees . 

 Trees struck by lightning 

 Eelative frequency . 



Oak. 



11 

 159 



48 



Beech. 



70 



21 



1 



Spruce. 



13 



20 



5 



Pine. 



6 



59 

 33 



Others. 



20 



This agrees generally with the results obtained in Detmold. 



Similar observations were made in the Bavarian State 

 forests, 18871890. 



* February, 1894, p. 78. 



