364 EQUINOCTIAL PLANTS. 



Mercury over the disc of the sun ; azimuths ; circum- 

 meridian altitudes of the moon, to determine the longi- 

 tude by the differences of declination ; researches on the 

 relative intensity of the light of the austral stars ; geo- 

 desical measures, &c. Secondly, a treatise on the astro- 

 nomical refractions in the torrid zone, considered as the 

 eifect of the decrement of caloric in the strata of the 

 air ; thirdly, the barometric measurement of the Cordil- 

 lera of the Andes, of Mexico, of the province of Vene- 

 zuela, of the kingdom of Quito, and of New Granada ; 

 followed by geological observations, and containing the 

 indication of four hundred and fifty-three heights, calcu- 

 lated according to the method of M. Laplace, and the 

 new co-efficient of M. Eaymond; fourthly, a table of 

 near seven hundred geographical positions on the ISTew 

 Continent ; two hundred and thirty -five of which have 

 been determined by my own observations, according to 

 the three co-ordinates of longitude, latitude, and height. 



"11. Equinoctial plants collected in Mexico^ in the island 

 of Cuba, in the ]jrovinces of Caracas^ Cumana^ and Barce- 

 lona^ on the Andes of New Grenada^ Quito, and Peru, and 

 on the banks of the Rio Negro, the Orinoco, and the River 

 Amazon. M, Bonpland has in this work given figures 

 of more than forty new genera of plants of the torrid 

 zone, classed according to their natural families. The 

 methodical descriptions of the species are both in French 

 and in Latin, and are accompanied by observations on 

 the medicinal properties of the plants, their use in the 

 arts, and the climate of the countries in which they are 

 found. 



" III. Monorjraphtj of the Melastoma, Rhexia, and other 

 genera of this order of plants, comprising upwards of a 



