THE SCHOOL OF FORESTRY IN THE ESCtfRIAL. 33 



level of mercury and eyeglass, Porro's simple level, Porro's 

 level with compass, simple level with eye-glass, 

 levels of Ertel, of Grairats, of Casella, and of Lincke with 

 eye-glass, eclimetric level of Chezy, great level of Dollon ; 

 miras, or sight knobs of different kinds. 



Instruments used in constructing Plans. Case of largo 

 mathematical instruments ; pocket case of instruments ; 

 graduated scales of wood, white metal, and platinum ; 

 rulers and squares, graduated squares, compasses ; semi- 

 circular transportador, with scale ; another with scale and 

 nonius, one with entire circle and nonius, that of Trougton 

 with two nonii ; pantograph. 



Determination of areas. Planimeters of Elliot, and of 

 Beuviere and Starcke. 



Various instruments. Eye-glass of prism, of Porro, of 

 observation and delineation ; astronomic telescope, sphero- 

 meter, Focometer,chronometer,D. Carlos Ibannez's apparatus 

 for measuring bases ; rule, stands, microscopes, levels, eye- 

 glass lor delineation, eye-glass for references, tracer, ivc. 



The programme of study in meteorology and climatology 

 comprises 1. The study of the atmosphere, and its 

 principle properties. 2. The nature and laws of light, 

 heat, magnetism, and electricity, and phenomena presented 

 by each of these agents. 3. Wind 8 : their origin, laws, 

 and different characters which they present. 4. Aqueous 

 meteors, and theories and hypotheses advanced in explana 

 tion of them. 5. Theoretic and experimental study of 

 apparatus used to measure the intensity of meteorological 

 phenomena. 6. Connection and dependence of some 

 meteors on others. 7. Climates : factcrs which determine 

 the origin and classification of different climates. 8. 

 Action of the atmospheric agents and of meteorological 

 phenomena on the life of plants. 9. Relations between 

 the factors of climate, and the orography, nature, and 

 vegetation of an extensive district. 



The Cabinet of Meteorological apparatus and a Meteoro- 

 logical observatory contain an anemometer by M, Osier; 



