Periodical Literature. 535 



the plants become more resistant. The best method of appHcation 

 is to use i^ to I 3/4 ounces per square yard and squirt it into six 

 or eight holes not deeper than 6 inches. The ground must not be 

 freshly worked or worked after treatment. Too dry and too wet 

 soils are unsuited to the treatment. The cost was such as to in- 

 crease the cost of plants 9 to 10%. 



Experiments to prevent oviposition were also made. Sunny 

 spots induce the depositing of eggs. An ill smelling tar prepar- 

 ation was used with advantage ; but neither this method nor cover- 

 ing with gravel or leaf litter produced uniform results. A 

 number of excellent illustrations bring the results of the poisoning 

 readily to view. 



Die Vernichtung der Engerlinge in den Porstgdrten. Schweizerische 

 Zeitschrift. April, 1912. Pp. 122-129. 



The long dry spell of the summer of 191 1 

 Drought had the most effect upon shallow rooted 



in, conifers like spruce and larch. The other 



German coniferous species, White and Scotch Pine 



Forests. and fir, did not suffer severely unless grow- 



ing on shallow soils. 

 The hardwoods showed less bad effects than the conifers 

 although this immunity must be partly ascribed to the good sites 

 upon which they were growing. Beech leaves turned yellow and 

 fell early, while the mast was short in quantity and poor in quality. 

 Oak, ash, alder, and hornbeam stood the drought well. The 

 locust proved to be especially resistant. 



The well weeded and cultivated nurseries sustained little 

 damage. 



Die Durre des letzten Sommers im Walde. Forstwiss. Centrablatt. 

 Feb., 1912. Pp. 81-89. 



Although the results of last summer's 



Effects drought were discussed from several points 



of of view in a series of articles reviewed in 



Drouth. the preceding issue (p. 283) one more by 



Klemp merits notice. This sets forth the 



effects of the heat and drought in two more Hessian reviers where 



plantations and thickets covering some 200 acres were destroyed. 



