E.. Uricoechea’s Chemical Examinations. 243 
After having established that the eggs of fishes contain sub- 
stances insoluble in water, ichthin and ichthulin, which have 
both of them, properties different from the vitellin of birds; we 
have inquired whether the albumen of fishes’ eggs is the same as 
that of birds’ eggs. Although we reserve the detailed account of 
this examination for a succeeding memoir, we are prepared to 
affirm that these two albuminous substances often present in their 
properties notable differences. In fact, the albumen of the eggs 
of certain fishes dissolves without any discoloration in hydro- 
chloric acid, and it begins to coagulate at about 45°; while the 
albumen of birds’ eggs, dissolves, as we know, in hydrochloric 
acid, and gives to the liquid, a violet-blue color, and it does not 
coagulate below 63°. Are these differences sufficient to admit 
really, in the animal organization several sorts of albumen? Can 
the blue color produced by hydrochloric acid, be considered as a 
Specific characteristic of albumen? In short, may not the min- 
eral salts contained in the albumen in different proportions, exer- 
cise an influence on the point of coagulation of this substance ? 
These are delicate questions whose importance we appreciate, 
and which we shall treat in a special article to be devoted to 
albuminous substances. 
(Zo be concluded.) 
Arr. XXVI.—Chemical Examinations; by Ezequren 
Uricorcuea, of Bogota. 
1. Chemical Examination of the Oloba, and of a new body, 
Olobile, contained in tt. 
The Oloba, a fat, has been known in New Granada for a very 
long time, and I have no doubt that the aborigines were the first 
to use it, for we know well that they used the palm-wax for 
Ulumination, as Pedro Ciezor De Leon* tells us. 
The tree which produces it is the Myristia Clobat of about 20 
Mariquita, west of the River Magdalena, a place well known for 
its silver mine. 
The use of Oloba is to my knowledge, exclusively, in veterinary 
icine, especially in the cure of skin complaints with horses, 
for although Garcia de Alonzot made in 1808 some experiments 
With reference to using it for illumination, I believe nobody has 
followed them up. 
* Cronica del Peru, Part I. : fe 
a et Bonpland, Plantes Equinoxiales, tome ii, p. 8. 
Semanario de la Nueva Granada, (2d ed.) 1848. p. 341. 
