[Gutenberg 43227] • The Fundamentals of Bacteriology

Excerpt from The Fundamentals of Bacteriology

The student in his biological courses has already learned the necessity of classifying living organisms. The division of the organic world into plants and animals is a very old one. It seems to have been based primarily on ability to move from place to place. Animals could move, plants could not. The first microscopic forms discovered in the seventeenth century were called animalcules, little animals, because many of them could be seen to move. The fact that all organisms are made up of cells and that there are organisms consisting of one cell only was a scientific contribution of the nineteenth century. The term protista is used to include all unicellular organisms; protozoa, the unicellular animals and protophyta the unicellular plants.

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