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 



-iO 



14) out of 40 trees 



12)' struck. 



15 1 out of 93 trees 



34) 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 " Revue des Eaux et Forets,"* the results are given 

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



This agrees generally with the results obtained in Detmold. 



Similar observations were made in the Bavarian State 

 forests, 1887—1890. 



• February, 1 81)4. p. 7s. 



