We must not leave Pará without alluding to our evening concerts from the adjoining woods and swamps. When I first heard this strange confusion of sounds, I thought it came from a crowd of men shouting loudly, though at a little distance. To my surprise, I found that the rioters were the frogs and toads in the neighborhood. I hardly know how to describe this Babel of woodland noises; and if I could do it justice, I am afraid my account would hardly be believed. At moments it seems like the barking of dogs, then like the calling of many voices on different keys, but all loud, rapid, excited, full of emphasis and variety. I think these frogs, like ours, must be silent at certain seasons of the year; for, on our first visit to Pará, we were not struck by this singular music, with which the woods now resound at nightfall. * * * * * NOTE.—Before leaving the Amazons, I wish to acknowledge attentions received from several friends, whose names do not appear in the narrative. To Senhor Danin, Chef de Police at Pará, I was indebted for valuable Indian curiosities, and for specimens of other kinds; to Doctor Malcher for a collection of birds; to Senhor Penna for important additions to my collection of fishes; to Senhor Laitaō da Cunha for aid in collecting, and for many introductions to persons of influence along our route; and to Mr. Kaulfuss, a German resident at Pará, for fossils from the Andes. I have to thank Mr. James Bond, United States Consul at Pará, for unwearied efforts in my behalf during the whole time of my stay in the Amazons. He supplied me with alcohol; received the collections on their arrival at Pará; examined the cases and barrels, causing those which were defective to be repaired, that they might reach their destination in safety, and finally despatched them to the United States, free of charge, on board sailing-vessels in which he had an interest. We owe it in great degree to him that our immense Amazonian collections arrived in Cambridge in good condition, suffering little loss or injury in the process of transportation.—L. A. ----- Footnote 88: During my short stay in the neighborhood of Villa Bella and Obydos I was indebted to several residents of these towns for assistance in collecting; especially to Padre Torquato and to Padre Antonio Mattos. My friend, Mr. Honorio, who accompanied me to this point, with the assistance of the Delegado, at Villa Bella, made also a very excellent collection of fishes in this vicinity. At Obydos Colonel Bentos contributed a very large collection of fishes from the Rio Trombetas.—L. A. Footnote 89: See Chapter XIII., on the Physical History of the Amazons. Footnote 90: