34 FORESTRY IN SPAIN. 



and another, that of Dr Robinson ; a barometer of 

 Newman, a large specimen; a well barometer, of the 

 English pattern, with the scale in inches ; two of Fortin's 

 barometers ; a barometer of Gay-Lussac ; an aneroid 

 barometer; a barometer of M. Bourdon ; a hygrometer of 

 Regnanlt, a hygrometer of Daniel; an English psycrometer, 

 by M. Casella, on Masstm's system ; ordinary thermometers; 

 also maxima and minima thermometers ; also that ot 

 Walferdin, &c. ; and a pluviometer. 



Of the arrangements made at the Escnria to facilitate 

 the study of forest science, that which proved most inter- 

 esting to me was the observatory, partly because of the 

 importance of the objects which it was designed to subserve, 

 partly because of the knowledge I have of work done by 

 students in the prosecution of researches connected with 

 them after they have left the school ; and partly because 

 of the simplicity and inexpensive character of the arrange- 

 ments made. 



The meteorological observatory is in the campo forestah of 

 the school. It is a building of less than twenty feet square, 

 and of similar height. On the flat stone roof of it are 

 arranged the instruments employed. To them all the 

 students have access at any time. Of these, from time to 

 time, two are appointed to make and record observations. 



The observations made by the students are published 

 every fortnight in the Revista de Monies, in a tabulated 

 form. In this are stated in regard to every day the height 

 of the barometer at 9 A.M. and at 3 P.M , the average or 

 medium height of these, and the variation found by 

 substracting from the greatest height at 3 P.M. the 

 lowest at A.M.; the maximum and minimum tem- 

 perature; the variation and the medium temperature oi 

 the ground ; the relative humidity at the same hours : 

 the rainfall ; the direction and the force of the wind ; and 

 observations in regard to the clouds in connection with the 

 state of the winds. 



The studies comprised under the head of Constructions 



