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Lamarck, however, proved equal to the task and was responsible for coining the term ''Invertebrate''. In effect, he creatred a whole new field of biology with his studies. In 1803, after 10 years of study, he was lectured his students that:

Lamarck, however, proved equal to the task and was responsible for coining the term ''Invertebrate''. In effect, he creatred a whole new field of biology with his studies. In 1803, after 10 years of study, he was lectured his students that:

      ''. . . we perceive that, relative to the animal kingdom, we should chiefly devote our attention to the invertebrate animals, because their enormous multiplicity in nature, the singular diversity of their systems of organization, and of their means of multiplication, . . . , show us, much better than the higher animals, the true course of nature, and the means which she has used and which she still unceasingly employs to give existence to all the living bodies of which we have knowledge.''

''we perceive that, relative to the animal kingdom, we should chiefly devote our attention to the invertebrate animals, because their enormous multiplicity in nature, the singular diversity of their systems of organization, and of their means of multiplication, . . . , show us, much better than the higher animals, the true course of nature, and the means which she has used and which she still unceasingly employs to give existence to all the living bodies of which we have knowledge.''

Lamarck published a series of books on invertebrate zoology and paleontology. Of these, ''Philosophie zoologique'', published in 1809, most clearly states Lamarck's theories of evolution. The first volume of ''Histoire naturelle des Animaux sans vertèbres'' was published in 1815, the second in 1822. Aside from Lamarck's contributions to evolutionary theory, his works on invertebrates represent a great advance over existing classifications; he was the first to separate the [[Crustacea]], [[Arachnida]], and [[Annelida]] from the [[Insecta.]] His classification of the mollusks was far in advance of anything proposed previously; Lamarck broke with tradition in removing the tunicates and the barnacles from the Mollusca. He also anticipated the work of Schleiden & Schwann in cell theory in stating that:

Lamarck published a series of books on invertebrate zoology and paleontology. Of these, ''Philosophie zoologique'', published in 1809, most clearly states Lamarck's theories of evolution. The first volume of ''Histoire naturelle des Animaux sans vertèbres'' was published in 1815, the second in 1822. Aside from Lamarck's contributions to evolutionary theory, his works on invertebrates represent a great advance over existing classifications; he was the first to separate the [[Crustacea]], [[Arachnida]], and [[Annelida]] from the [[Insecta.]] His classification of the mollusks was far in advance of anything proposed previously; Lamarck broke with tradition in removing the tunicates and the barnacles from the Mollusca. He also anticipated the work of Schleiden & Schwann in cell theory in stating that:

     ''. . . no body can have life if its constituent parts are not cellular tissue or are not formed by cellular tissue.''  

     ''no body can have life if its constituent parts are not cellular tissue or are not formed by cellular tissue.''  

Lamarck even found time to write papers on physics and meteorology, including some annual compilations of weather data.

Lamarck even found time to write papers on physics and meteorology, including some annual compilations of weather data.