The Naturalist on the River Amazons [2]
of this time Mr. Bates' headquarters were at Ega, on the Teffe, a confluent of the great river from the south, whence excursions were made sometimes for 300 or 400 miles into the interior. In the intervals Mr. Bates followed his pursuit as a collecting naturalist in the same "peaceful, regular way," as he might have done in a European village. Our author draws a most striking picture of the quiet, secluded life he led in this far-distant spot. The difficulty of getting news and the want of intellectual society were the great drawbacks--"the latter increasing until it became almost insupportable." "I was obliged at last," Mr. Bates naively remarks, "to come to the conclusion that the contemplation of Nature, alone is not sufficient to fill the human heart and mind." Mr. Bates must indeed have been driven to great straits as regards his mental food, when, as he tell us, he took to reading the Athenaeum three times over, "the first time devouring the more interesting articles--the second, the whole of the remainder--and the third, reading all the advertisements from beginning to end."
Ega was, indeed, as Mr. Bates remarks, a fine field for a Natural History collector, the only previous scientific visitants to that region having been the German Naturalists, Spix and Martius, and the Count de Castelnau when he descended the Amazons from the Pacific. Mr. Bates' account of the monkeys of the genera Brachyuyus, Nyctipithecus and Midas met with in this region, and the whole of the very pregnant remarks which follow on the American forms of the Quadrumana, will be read with interest by every one, particularly by those who pay attention to the important subject of geographical distribution. We need hardly say that Mr. Bates, after the attention he has bestowed upon this question, is a zealous advocate of the hypothesis of the origin of species by derivation from a common stock. After giving an outline of the general distribution of Monkeys, he clearly argues that unless the "common origin at least of the species of a family be admitted, the problem of their distribution must remain an inexplicable mystery." Mr. Bates evidently thoroughly understands the nature of this interesting problem, and in another passage, in which the very singular distribution of the Butterflies of the genus Heliconius is enlarged upon, concludes with the following significant remarks upon this important subject:
"In the controversy which is being waged amongst Naturalists since the publication of the Darwinian theory of the origin of species, it has been rightly said that no proof at present existed of the production of a physiological species, that is, a form which will not interbreed with the one from which it was derived, although given ample opportunities of doing so, and does not exhibit signs of reverting to its parent form when placed under the same conditions with it. Morphological species, that is, forms which differ to an amount that would justify their being considered good species, have been produced in plenty through selection by man out of variations arising under domestication or cultivation. The facts just given are therefore of some scientific importance, for they tend to show that a physiological species can be and is produced in nature out of the varieties of a pre-existing closely allied one. This is not an isolated case, for I observed in the course of my travels a number of similar instances. But in very few has it happened that the species which clearly appears to be the parent, co-exists with one that has been evidently derived from it. Generally the supposed parent also seems to have been modified, and then the demonstration is not so clear, for some of the links in the chain of variation are wanting. The process of origination of a species in nature as it takes place successively, must be ever, perhaps, beyond man's power to trace, on account of the great lapse of time it requires. But we can obtain a fair view of it by tracing a variable and far-spreading species over the wide area of its present distribution; and a long observation
Ega was, indeed, as Mr. Bates remarks, a fine field for a Natural History collector, the only previous scientific visitants to that region having been the German Naturalists, Spix and Martius, and the Count de Castelnau when he descended the Amazons from the Pacific. Mr. Bates' account of the monkeys of the genera Brachyuyus, Nyctipithecus and Midas met with in this region, and the whole of the very pregnant remarks which follow on the American forms of the Quadrumana, will be read with interest by every one, particularly by those who pay attention to the important subject of geographical distribution. We need hardly say that Mr. Bates, after the attention he has bestowed upon this question, is a zealous advocate of the hypothesis of the origin of species by derivation from a common stock. After giving an outline of the general distribution of Monkeys, he clearly argues that unless the "common origin at least of the species of a family be admitted, the problem of their distribution must remain an inexplicable mystery." Mr. Bates evidently thoroughly understands the nature of this interesting problem, and in another passage, in which the very singular distribution of the Butterflies of the genus Heliconius is enlarged upon, concludes with the following significant remarks upon this important subject:
"In the controversy which is being waged amongst Naturalists since the publication of the Darwinian theory of the origin of species, it has been rightly said that no proof at present existed of the production of a physiological species, that is, a form which will not interbreed with the one from which it was derived, although given ample opportunities of doing so, and does not exhibit signs of reverting to its parent form when placed under the same conditions with it. Morphological species, that is, forms which differ to an amount that would justify their being considered good species, have been produced in plenty through selection by man out of variations arising under domestication or cultivation. The facts just given are therefore of some scientific importance, for they tend to show that a physiological species can be and is produced in nature out of the varieties of a pre-existing closely allied one. This is not an isolated case, for I observed in the course of my travels a number of similar instances. But in very few has it happened that the species which clearly appears to be the parent, co-exists with one that has been evidently derived from it. Generally the supposed parent also seems to have been modified, and then the demonstration is not so clear, for some of the links in the chain of variation are wanting. The process of origination of a species in nature as it takes place successively, must be ever, perhaps, beyond man's power to trace, on account of the great lapse of time it requires. But we can obtain a fair view of it by tracing a variable and far-spreading species over the wide area of its present distribution; and a long observation