54 FORESTRY IN SPAIN. 



Another of the papers published by Senor Alvarez is 

 one under the title Trabajos de Ebermayer. On the works 

 of Ebermayer, in which are discussed successively the 

 influence of forests on the humidity of the atmosphere ; 

 on the humidity of the ground ; on the temperature of 

 the ground ; on the temperature of the atmosphere ; and 

 on the constituents of lihe atmosphere. 



The views of Ebermayer are also brought forward at 

 great length in a brochure entitled Breves Consideraciones 

 fiobre Estatica Quimica Brief remarks on forestal chemical 

 statistics by Senor D. Luis de la Escosura y Coronel, 

 Chief in Corps of Forest Engineers. In this the author 

 sought to give as detailed an analysis as possible of the 

 valuable work by that distinguished Professor of Agricultural 

 Chemistry and of Geognosia, in the Royal Central School 

 of Forestry at Ascaffenburg, entitled Die gesammte Lehr? 

 der Waldstreu, mit ttuecksicht auf die chemische Statik des 

 Waldbaues. Unter Zugrundlegung der in dem Kcenigl, 

 Staatsforsten Bayerns angelstellten Untersuchungen a 

 work, to follow a description given of it by M. Grandeau, 

 methodical in the highest degree, and written with sobriety 

 and lucidity, the perusal of which is lightsome and inter- 

 esting, notwithstanding the numerous statistical and 

 analytical data which it contains ; and beyond all manner 

 of doubt one of the most important forestal works of our 

 age. 



The author commences with the study of the formation 

 of the covering of the forest ground ; that is of the condi- 

 tions of the fall of the leaves, comprising the causes, the 

 times, the quantative importance according to species of 

 trees, the altitudes at which they grow, &c. In the second 

 chapter he takes up the data procured by analysis, in 

 reference to the chemical composition of the ground covering, 

 and of the wood ; determining thus the chemical statistics 

 of the forests. In the third he brings under considera- 

 tion the physical properties of that covering, and the 

 influence which this exercises on the physical properties 

 of the ground. In the fourth, attention is given to 



