The irregularity in the navigation either due to the deficiency of the floating material or by the natural obstacles that the flooding of the rivers bring about, cause extensive prejudice, as it obliges the large cargoes of merchandise upon whose price high interest is collected and occasions them considerable loss of goods deteriorated by their remaining for a long time in sheds and by the damaging effect of heat and dampness. From thence arises the lamentable dearness of life and the bad alimentation, with their evil results on the health of the inhabitants of those far-away-regions. The retention in the seringaes of large stocks of rubber deprived of the means of transport must also not be forgotten and its coming simultaneously on to the market at certain times, being taken advantage of by speculators is an important cause of the fall in prices which affects the interests of producers to an appreciable degree. Regularity and frequency in navigation, permitting successive and regular supplies of rubber would diminish in notable proportions the cost of production, since it would cheapen the cost of labor and avoid the great oscillations usual in the prices. In order to obtain that desideratum it is not sufficient to create new lines of navigation nor to augment the number of floating material or better their conditions, but it is necessary to adopt certain complementary measures. Thus in the impossibility of preparing from the outset minute hydrographic charts, a measure which would require great expenditure; it were advisable in order to make navigation more secure to indicate by means of small light houses and illuminated buoys of acetyline, the dangerous points which it is desirable to avoid. In order to obviate the difficulties created by the formation of sand banks, by the accumulation of trunks of trees, and of obstacles of all kinds, it is necessary that attention be paid constantly to the cleansing of the rivers and dragging them, in cases where the obstructions cannot be removed by other means and the construction of railways and wagon roads connecting the navigable points. It would be of the greatest utility to bring about the extension and opening up of telegraphic lines joining the producing centres with the central markets, such measures would have the most beneficient results as much for the owners of seringaes as for the shipowners, these latter being once aware of such facilities would cause their ships to be directed to the points where they were required to discharge merchandise or take in rubber or vice-versa and thus avoid all uncertainty upon the advantages to be reaped from those trips, because of the want of knowledge of the cargoes that are being reserved for them, and those who are in contact with them in the markets where the product is sold may be advised as to the quotations and the market prices of the merchandise so that they may take advantage of the most favorable times for effecting their transactions.