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He took up his position between the towns of Pandosia and Heraclea, on the River Siris. The Romans, who were encamped on the other side of the river, were the first to begin the battle. They crossed the river, and were immediately attacked by the cavalry of Pyrrhus, who led them to the charge in person, and distinguished himself as usual by the most daring acts of valor. The Romans, however, bravely sustained the attack; and Pyrrhus, finding that his cavalry could not decide the day, ordered his infantry to advance. The battle was still contested most furiously: seven times did both armies advance and retreat; and it was not till Pyrrhus brought forward his elephants, which bore down every thing before them, that the Romans took to flight, leaving their camp to the conqueror (B.C. 280).

We left at 7.30 a.m. under a limpid sky of gorgeous cobalt blue. We passed two islands--one 700 m. long (Leda Island), the other 2,000 m. (Leander Island). When we had gone but 11,500 m. we arrived at one of the most beautiful bits of river scenery I have ever gazed upon--the spot where the immense S. Manoel River or Tres Barras or Paranatinga met the Arinos-Juruena. The latter river at that spot described a sharp turn from 20 deg. b.m. to 320 deg. b.m. We perceived a range of hills before us to the north. Close to the bank gradually appeared a large shed with a clearing near it on a high headland some 200 ft. above the level of the river where the stream turned. On the left bank, before we arrived at the meeting-place of those two giant streams, we found a tributary, the Bararati, 30 m. broad.

It is obvious that even the problem of _coadaptation in sterile animals_ can thus be satisfactorily explained. If the determinants are oscillating upwards and downwards in continual fluctuation, and varying more pronouncedly now in one direction now in the other, useful variations of every determinant will continually present themselves anew, and may, in the course of generations, be combined with one another in various ways. But there is one character of the determinants that greatly facilitates this complex process of selection, that, after a certain limit has been reached, they go on varying in the same direction. From this it follows that development along a path once struck out may proceed without the continual intervention of personal selection. This factor only operates, so to speak, at the beginning, when it selects the determinants which are varying in the right direction, and again at the end, when it is necessary to put a check upon further variation. In addition to this, enormously long periods have been available for all these adaptations, as the very gradual transition stages between females and workers in many species plainly show, and thus this process of transformation loses the marvellous and mysterious character that seemed at the first glance to invest it, and takes rank, without any straining, among the other processes of selection. It seems to me that, from the facts that sterile animal forms can adapt themselves to new vital functions, their superfluous parts degenerate, and the parts more used adapt themselves in an ascending direction, those less used in a descending direction, we must draw the conclusion that harmonious adaptation here comes about _without the cooeperation of the Lamarckian principle_. This conclusion once established, however, we have no reason to refer the thousands of cases of harmonious adaptation, which occur in exactly the same way among other animals or plants, to a principle, the _active intervention of which in the transformation of species is nowhere proved. We do not require it to explain the facts, and therefore we must not assume it._

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