. The Tineina of North America [microform] : being a collected edition of his writings of that group of insects. Moths; Lepidoptera; Hétérocères; Lépidoptères. LETTER OF JUNE 23RD, 1860. 33 from a stnignnle for existence adds nothing to our knoAvlcclg^e, and is flatly contradicted by all our physiological facts. It is really a re\ ival of the doctrine of Von Bar enunciated nearly fifty years ago, " That heterogeneous or special structure arises out of one more homogeneous or general, and this hy means of gradual ;" This united to the doctrine of transnuitation puts us in
. The Tineina of North America [microform] : being a collected edition of his writings of that group of insects. Moths; Lepidoptera; Hétérocères; Lépidoptères. LETTER OF JUNE 23RD, 1860. 33 from a stnignnle for existence adds nothing to our knoAvlcclg^e, and is flatly contradicted by all our physiological facts. It is really a re\ ival of the doctrine of Von Bar enunciated nearly fifty years ago, " That heterogeneous or special structure arises out of one more homogeneous or general, and this hy means of gradual ;" This united to the doctrine of transnuitation puts us in possession of the entire Darwinian theory. 1^-of Agassiz is noAV writing a reply to his argument, and in this, all that can be urged in favour of immutability will be ably advocated and represented. Even if the theory of the immutability of species must be abandoned, from the accumulation of testimony against it, there is still, in my own vicAv, a safe and reasonable intermediate position Avliich can be occupied. This I conceive is indicated in the proposition of Dr. Le Conte as contained in my introductory remarks in the Synopsis of the N. A. Sphingidce. I have been preparing to A\Tite a Monograph of the Ameri- can Tincina, but greatly to my regret I must defer the com- mencement of the work for at least another year. All the material that is accumulated results from my own industry, and thus far my captures have been almost purely local. At the end of this season I shall be able to determine how much and Avhat kind of assistance I shall receive from others. A few students and collectors are collecting for me at present in various parts of the country, but the region thus occupied is not by any means sufficiently extensive. They are all north of 38° N. latitude, and all my efforts are now devoted to obtaining collections south of this, or in the extrerao southern states, but thus far Avithout any success. It may interest you to know that I have constructed a Synoptical T
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectmoths, bookyear1872
