Col. Wright's Meteorological Observations in Colombia. 95 



Resin from the root of 



ArbreaBrai = Cgg H30 O Dumas. 



Anime resin = C^g Hgg O Laurent. 



Fossil copal = C^q H32 O 



Elemi resin = C40 H32 Og Rose. 



Colophony (pinic and syl-\ _ p -tr ' n / Liebig and 



vie acid) / - '"lo "30 ^4 -j^ Trommsdorf. 



Pasto varnish = C40 Hg^ Og Boussingault. 



Berengelite { = n'° S'^ 0' ^ °' 



Middletonite = C40 Hga Og 



Guyaquillite = C40 Hgg Og 



Resin of retinasphalt ~1 = C^q H2-. O,- ? or 



(retinic acid) J = C42 Hg'g O^ 



Gamboge | = ^"o H24 Og ? or 



L = ^48 ^29 C)]o 



Eblanin ^ = C40 H20 Og?l^Apjohn and 



L = C42 H18 Og /Gregory. 



In these formulae, which from the nature of the substances 

 may all be subject to future corrections, we see a mode of re- 

 presenting, at least approximately, all the analysed resins 

 (with one exception) by quantities in which that of carbon is 

 constant. It would be a very beautiful general expression 

 which in the form of C40 Hgo—j. 0^+^ should represent the con- 

 stitution of all or of one great group of the resins. Our data, 

 however, are not yet sufficiently extensive to enable us to 

 form a decided opinion on the subject. In a future paper I 

 shall give the composition of some other resins, and consider 

 this point at greater length than it would be proper to do at 

 tlie close of the present paper. 



Durham, Dec. 6, 1838. 



XIX. Meteorological Observations dwing a Hesidence in Co- 

 lombia bet'ween the Years 1820 and 1830. By Colonel 

 Richard Wright, Governor of the Province of Loxa, 

 Coiifidential Agent of the Bepublic of the Equator, <$-c. Sfc. 



[Continued from p. 18.] 



A LTHOUGH it scarcely falls within the limits of a mere 

 ■^^ meteorological journal to expatiate on the wide field of 

 inference which opens to our view when we reflect on the 

 influence of temperature, not merely on animal but on social 

 life, yet the operation of local circumstances has been so 

 striking, and will probably play so important a part in the 

 future destinies of the South American continent, that it is 

 difficult to forbear some remarks 011 so interesting a subject. 



