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The demands of bacteriology for the classification of a group of organisms which on account of their minuteness do not lend themselves to conventional structural differentiation has occasioned the development and utilization of different criteria of organic relationship. These criteria, though they have found little favor outside this restricted field, apply equally to the classification of all organisms; and, moreover, from a physiological point of view constitute a more fundamental species concept than one based on structural differentiation. The fundamental basis of these criteria is the conception that organisms differ in the chemical constitution of their protoplasm. The methods of making the determination may be considered indirect, from chemical standards, but they are none the less precise: namely, the methods of immunology. |
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