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on the fibrinogen of the plasma. The various visible stages of this coagula-
tion show differences reflecting variations in the underlying chemical
phenomena.The first type of coagulation is characterized by the development around
the coagulocytes of islands of coagulating material and the extension of the
process to wider areas by the subsequent organization of this coagulum
into a network. In a second type, the coagulocytes extrude threadlike
pseudopodial extensions which form networks of varying complexity and
on which veils of coagulated plasma often appear.Orthoptera and Dermaptera are uniform in showing coagulation of the
first type. The same type is found among Hemiptera, in the family Nepidae,
the other families of the order lacking the ability to coagulate. The second
type is found in all the Lepidoptera.Other biochemical characters are peculiar to one or other order of insects.
The plasma inorganic bases of Lepidoptera are characteristic in that there
is a high percentage of magnesium and potassium and a low percentage
of sodium.Within the order Lepidotera, certain biochemical characters are typical
of certain sub-divisions of the order as has been shown by E. B. Ford in
his extensive studies on the wing pigments of butterflies.The interest of comparative biochemistry springs from the fact that it is
an extension of, and a support to, taxonomy, and thus it becomes possible
to connect the study of biochemical diversity and the treasure of accumu-
lated knowledge obtained by naturalists over several centuries.
REFERENCES
FOGG C. E. ( 1953). The Metabolism of Algae. Methuen, London.
FLORKIN MARCEL. ( 1944) L'évolution biochimique. Masson, Paris.
FLORKIN MARCEL. ( 1952). Caractères biochimiques, des catégories supraspécifiques
de la systématique animale. Ann. Soc. Roy. Zool. Belg., 83, 111-130.
HARRIS H. ( 1953). An Introduction to Human Biochemical Genetics. Cambridge
Univ. Press, London.
HASLEWOOD G. A. D. ( 1955). Recent development in our knowledge of bile salts.
Physiol. Rev., 35, 178-196.
KLEIN G. (Editor). Handbuch der Pflanzenanalyse. Springer, Vienna, 1931- 1933.
MOLISCH HANS ( 1933). Pflanzenchemie und Pflanzenwerwandschaft. Fischer, Jena.
WILLIAMS R. J. ( 1956). Biochemical Individuality. Wiley, New York.

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Publication Information: Book Title: Unity and Diversity in Biochemistry: An Introduction to Chemical Biology. Contributors: Marcel Florkin - author, T. Wood - transltr. Publisher: Pergamon Press. Place of Publication: Oxford. Publication Year: 1960. Page Number: 332.
    
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