I´ve used the google translator (is too much text) so this is a fragment of Barthelemy´s report:
"I've often wondered why our kings (perhaps considering the wealth of France and its own resources) have neglected navigation, ports and rivers having two seas and subjects that are driven by natural inclination and habit to look for courage in the most distant climates are fortunate that in his country, both because each is in his art and profession countless competitors, such as that due to the extension of the kingdom, although large, is disproportionate to the multitude of peoples, from which they disperse all over the world to the less frequented and livable, where they take their knowledge of the arts and the use of weapons, strengthening States foreign princes with so great advantages and especially between villages and naturalization them, which is detrimental to the military glory of France and manufacture of its artisans.
[...] In the Rio de la Plata there is more than the city of Buenos Aires, located on this beautiful river sixty miles from the sea side of the south pole, where the surroundings are vast fields that stretch for more than two hundred leagues with no room and so flat and together forming a horizon on all sides equal and circular, so you lost your bearings and you have to help with the compass if you exit routes. They are covered with an amazing crowd of horses and bulls, almost all wild, not in Buenos Aires are worth more than a shield piece and trafficking of these beasts is of inestimable importance to all other places in America where comes to seek them, and particularly in Potosí, where the mines throughout Peru, and Chile, which persists to the Indian resistance against the Spanish in a bloody war and balanced. All year round the countryside provides plenty of fodder too. It also gives wheat and wine in his land, the flesh could not miss the largest ever for the world's navies. The water from the river is considered incomparable air of the country is softer, healthier and warmer throughout the habitable land in the opinion of those who have breathed, the first Spanish who made this discovery when witnesses of this truth, they named Buenos Aires to this place.
[...] Buenos Aires is a small village three to four families, which has no defense for more than two hundred soldiers stationed in two companies, one governor, one major and two captains. There may be four people able to make weapons is not protected or defended by any wall, fence or ditch. The river bed is very deep, and a providence, preserved the lands of the flood when it grows or swells the sea winds, which raises the maximum current to the top of your channel without allowing it to overflow never . It has a small fort on the top of the slope of the ravine, with respect to water and moored ships is high, but not with respect to the city and countryside, which are at your same level.
[...]
It is assumed by the traditions that there are rich mines of gold and silver, but at least is certain is that this country next to Paraguay to the southwest side is the same quality and fertility, is bounded on the north side with one of the Portuguese colonies called the captaincy of Sao Paulo, which is the last and most southern Brazil, where there are wheat, wine, sugar, mining of gold and emerald are untapped for lack of men and being away from people the Portuguese, these two have been in Lisbon monstrous riches. This colony is about three or four hundred miles from Buenos Aires, and most of this distance can navigate the Parana River, which is born and then mixing the water with the silver in a town called the seven streams, which is the have only the Spanish on the other coast, about two hundred leagues from Buenos Aires. [...]
I believe that peace is not related to this project and the actual and specific grounds of religion and propagating the faith among these barbarians, is reason enough to authorize the company and bring the rule of our kings. These are vague and unclaimed assets that God has created all nations alike to discover that, when there is no possession to defend the entrance, and the Spanish should not be surprised that Christian people bring the light of the Gospel given to lands whose possession rightful place as his forgetfulness or impotence.
I can not forbear to mention here the great value that take the Jesuits of large contiguous regions of Paraguay, on both shores of the Parana River, which have absolutely no interference or other Spanish secular nation, more than the Indians in the country. Twenty-four missions are many villages or towns with well-organized and justice which have temporal and spiritual government of arms, the King of Spain has agreed to them to defend themselves from invasion of the Portuguese of Sao Paulo, that repeatedly entered their land at gunpoint, and the last time have been sent back by the mission Indians, to whom these parents taught the arts and sciences and the profession of arms. French parents among them, one called the Father Pestot, Lion, knowing that one of my brothers was in Buenos Aires, asked in his letters go to take the habit of the Company and accountable while all what I have to say and many other things concerning the goodness of the country and its way of life. They (the Jesuits) are extremely dear to the Indians within its domain and the King of Spain paid a great tribute to keep the freedom and authority they have over all other missions. Following this second path would be easy in the first war take Buenos Aires whose inhabitants themselves, to enjoy the trade (they have been cut off and without which they are miserable), they would be happy to restore it by joining the French, without waiting for the insults and hostilities of the war, and if the worst were to openly attack the square, and assuming a deliberate defense, it would take more than a thousand men for this action, and if you follow the prescribed instructions we will not miss one. "