THE LIBRARY, 55 



chemical modifications experienced in the ground-covering 

 of forests, and its chemical action on the ground. In the 

 fifth and last chapter are brought under consideration 

 the influence on the forest of the removal of the leaves 

 and other debris constituting the ground-covering of the 

 forest. In an appendix is given a statistical comparison 

 between agricultural and sylvicultural productions, and 

 tabulated statements of numerous data which had served 

 as a basis for the conclusions of the author. 



In 1879 was published a brochure entitled Inundaciones 

 y sequias medios de defensa Jn forme redactado por acuerdo 

 de la Junta Directiva de la Sociedad Geografica de Madrid, 

 con motivo de la Inundaciones de Murcia ; por El Exmo, 

 Senor Don Frederico de Botello y de Hornos which is full 

 of important and interesting details, illustrative of the 

 production of torrential rains, and consequent torrents in 

 mountainous regions, and wide-spread inundations on 

 plains ; all which, it is shown, might in many cases, if not 

 also in every case, be prevented by planting the basin 

 receiving the rainfall with herbage and bushes and trees. 



In the following year (1880) was published, Lluvias e 

 Inundaciones : Distribution general de las aquas en toda la 

 superficie del gloLo y panicularmente en Kspanna ; Torea de 

 las Avenidas, de los rios y medios de evitarlas y resistirlas ; 

 por D. Vincente de Vera y Lopez, Doctor en Ciencias, Qui- 

 mico del Ayuntamiento de Madrid ; con un prologo, de D. 

 Manuel Maria Jose de Galbo. 



After notices of the general distribution of the rainfall 

 over the surface of the globe, and illustrations of the effect 

 of circumstances upon this, the author takes up the con- 

 sideration of the rainfall in different regions in the 

 Peninsula, and the local conditions of these. There is 

 given then an exposition of the theory of floods, with 

 details of the action of geographical position in regard to 

 latitude on varying degrees of humidity in the atmosphere ; 

 of the influence of the geological character of the ground ; 



