Volume 1

More letters of Charles Darwin : a record of his work in a series of hitherto unpublished letters / edited by Francis Darwin ... and A.C. Seward.

  • Charles Darwin
Date:
1903
Catalogue details

Licence: Public Domain Mark

Credit: More letters of Charles Darwin : a record of his work in a series of hitherto unpublished letters / edited by Francis Darwin ... and A.C. Seward. Source: Wellcome Collection.

    47/545 page 16
    Letter 5 me ; some of his woodcuts came so exactly into play that I have only to refer to them instead of redrawing similar ones. I had my barometer with me, I only wish I had used it more in these plains. The valley of S. Cruz appears to me a very curious one ; at first it quite baffled me. I believe I can show good reasons for supposing it to have been once a northern straits like to that of Magellan. When I return to England you will have some hard work in winnowing my Geology; what little I know I have learnt in such a curious fashion that I often feel very doubtful about the number of grains [of value ?]. Whatever number they may turn out, I have enjoyed extreme pleasure in collecting them. In T. del Fuego I collected and examined some corallines ; I have observed one fact which quite startled me : it is that in the genus Sertularia (taken in its most restricted form as [used] by Lamoureux) and in two species which, excluding compara¬ tive expressions, I should find much difficulty in describing as different, the polypi quite and essentially differed in all their most important and evident parts of structure. I have already seen enough to be convinced that the present families of corallines as arranged by Lamarck, Cuvier, etc., are highly artificial. It appears that they are in the same state [in] which shells were when Linnasus left them for Cuvier to rearrange. I do so wish I was a better hand at dissecting, I find I can do very little in the minute parts of* structure ; I am forced to take a very rough examination as a type for different classes of structure. It is most extraordinary I can nowhere see in my books one single description of the polypus of any one coralline excepting Alcyonium Lobularia of Savigny. I found a curious little stony Cellaria 1 (a new genus) each cell provided with long toothed bristle, these are capable of various and rapid motions. This motion is often simultaneous, and can be produced by irritation. This fact, as far as I can see, is quite isolated in the history of zoophytes (excepting the Flustra with an organ like a vulture’s head); it points out a much more intimate relation between the polypi than Lamarck is willing to allow. I forgot whether I mentioned having seen something of the manner of propa¬ gation in that most ambiguous family, the corallines ; I feel 1 Cellaria, a genus of Bryozoa, placed in the section Flustrijia of the Suborder Chilostomata.
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