By Louis Agassiz; Elizabeth Cary Agassiz
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They are destitute of ventrals, thus showing that the genus Orestias stands lowest in its family. I would allude to one other fact of this kind observed by Professor Wyman. There has been a doubt among naturalists as to the relative standing of the Skates and Sharks. On geological evidence I had placed the Skates highest, because the Sharks precede them in time; but this fact had not been established on embryological evidence. lendel' in outline, with the appearance of a diminutive t;'l k, and that only later it assumes the broad shieltl-liko form and 38 A JOURNEY IN BRAZIL.
Yesterday was Easter Sunday, and the day was beautiful. The services from Bishop Potter in the morning were very interesting; the more so for us on account of the God speed he gave us. Wind and weather permitting, it is the last Supday we shall pass on board ship together. The Bishop spoke with much earnestness and sympathy of the objects of the expedition, addressing himself especially to the young men, not only with reference to their duties as connected with a scientific undertaking, but as American citizens in a foreign country at this time of war and misapprehension.
He principal object, however, was to show in what direction they should work in order to give greater precision to the general information already secured respecting the formation of the continent. "The basin of the Amazons, for instance, i a level plain. The whole of it is covcred with loose materials. We must watch carefully thc character of these loose materials, and try to track them to their origin. As there a:,re very characteristic rocks in various parts of this plain, we shall bave a clew to the nature of at least some portion of these materials.
A Journey in Brazil by Louis Agassiz; Elizabeth Cary Agassiz