MY DEAREST DADDY,--Great was my joy the other evening, on arriving at Manaos, to get a batch of letters from you.... I could do no more then than merely "accuse" the reception. Now I can manage to sweat out a few lines of reply. It is noon and the heat is frightful. We have all come to the conclusion that, for _us_ at least, there will be no hell hereafter. We have all become regular alembics, and the heat grows upon you, I find. Nevertheless it is not the dead, sickening heat of home. It is more like a lively baking, and the nights remain cool. We are just entering on the mosquito country, and I suspect our suffering will be great from them and the flies. While the steamboat is in motion we don't have them, but when she stops you can hardly open your mouth without getting it full of them. Poor Mr. Bourkhardt is awfully poisoned and swollen up by bites he got ten days ago on a bayou. At the same time with the mosquitoes, the other living things seem to increase; so it has its good side. The river is much narrower--about two miles wide perhaps or three (I'm no judge)--very darkly muddy and swirling rapidly down past the beautiful woods and islands. We are all going up as far as Tabatinga, when the Professor and Madam, with some others, go into Peru to the Mountains, while Bourget and I will get a canoe and some men and spend a month on the river between Tabatinga and Ega. Bourget is a very dog, yapping and yelping at every one, but a very hard-working collector, and I can get along very well with him. We shall have a very gypsy-like, if a very uncomfortable time. The best of this river is that you can't bathe in it on account of the numerous anthropophagous fishes who bite mouthfuls out of you. Tom Ward _may_ possibly be out and at Manaos by the time we get back there at the end of October. Heaven grant he may, poor fellow! I'd rather see him than any one on this continent. Agassiz is perfectly delighted with him, his intelligence and his energy, thinks him in fact much the best man of the expedition.