CNFLAMMAlSLE EXHALATIONS. 
67 
'disengagement of hydrogen.* When travellers, who are not 
acquainted with natural inflammable gases, are shown the 
Guava del Serrito de Monai, the people of the country love 
to frighten them by setting fire to the gaseous combination 
which is constantly accumulated in the upper part of the 
cavern. May we attribute the insalubrity of the atmosphere 
° - e same causes as those which operate in the plains be- 
v een n oli and Rome, viz., disengagements of sulphuretted 
y rogen.f Possibly, also, the mountainous lands, near 
e an os ot Monai, may have a baneful influence on the 
m in 1 ''’' P !UI1 ®', ^ ' le south-easterly winds may convey 
nf vrut In 16 P u j’, ri(1 ex hala,tions that rise from the ravine 
and n ®S as > and from La Sienega de Cabra, between Carora 
ana earache. I am desirous of collecting every circum- 
stance having a relation to the salubrity of the air; for Ta 
ber ofnho CUre ’ ° 1,ly by the comparison of a great num- 
ber of phenomena, that we can hope to discover the truth. 
he barren yet fevensli savannahs, extending from Bar- 
» to the eastern shore of the lake of uLnyboX 
k ow i bvTh " CaCtUS; b - Ut th6 S ood silvester-cochfoeal, 
moriTt™, I™ 81 * 6 nam ! 0t ' Jrnna de Carora ’ comes from a 
more temperate region, between Carora and Truxillo, and 
* What is that luminous phenomenon known under the nnvne nf ,b 
leagues, at which the light if observed has led m th" 106 ’ than 40 
ar*r se s xz 
tin. s££jr ^ 
tidnous ami u^h SET“- Th ” l'^enomenon is observed on a moun. 
STunetl™ w b 1 o- 1 T\: the bo, ' llers ,,f the Ri <> Catatumbo, near 
beine near IT, u 16 Sulm ; The situation of the farol is such that, 
cavbo * 16 merldlan °t the opening (boca) of the lake of Mara- 
+ T) A ga J° rS are S uided hy it as by a lighthouse, 
the j j 4,020 bas discovered >n this district, at the bottom of 
soiling tb « ‘ de Mo . roturo ' “ stratum of clayey earth, black, stronglv 
*Dontfn»„ , ger . S ’ em , ] . tt,n B a powerful smell of sulphur, and inflaming 
the raws Jfo '' " n . sll S ht, y moistened and exposed for a long time tc 
very violent. * tro i llca4 sun - The detonation of this muddy substance u 
