ISBN: 9781130295764

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 208 pages. Dimensions: 9.7in. x 7.4in. x 0.4in.This historic book may have numerous typos and missing text. Pur… More...

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 208 pages. Dimensions: 9.7in. x 7.4in. x 0.4in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: . . . to which either of these factors takes part in producing colouration. Thus brown and green are by far the commonest instances of dimorphism, and when this is the case the former is due to larval pigment, the latter to derived plant pigments. It is very remarkable that there should be such an essential difference between the larvae from the same batch of csrgs, as far as the causes of colour are concerned. Mr. Raphael Meldola has very conclusively argued for chlorophyll as the cause of the colour in green larvae in a paper in the Proc. Zool. Soc. for It will be shown that the derived chlorophyll of larvee has undergone chemical changes of which the effects appear in the altered spectrum, and in the great stability of the pigment when present in the animal blood or tissues. If, on the (ither hand, the chlorophyll be separated from the proteid with which it is united in t he animal, it is so unstable that the colour disappears at once, and it is impossible to obtain it in solution by the use of the ordinary solvents of vegetal chlorophyll (or by any reagents of which I have made use). The spectrum and chemical characters are very constant, seeming to prove that the same definite changes are wrought by many species of insect. At the suggestion of Professor K. Kay Lankester, 1 propose to call this derived pigment metnchlorophyll. The spectrum of the green blood of the pupa of Ephym Punctaria differs from that of other larva; and pur hitherto examined, and I propose for this form of derived pigment the term Ephyrachlorophyll. There is not at present sufficient ground for giving a distinct iu-name to the derived xanthophyll. --May 4th, 1885. 1873, p. 155. He explains the relation between larval and vegetal colouration, by supposing that the. . . This item ships from La Vergne,TN., RareBooksClub<