. Fig. 212. — Conidia and conidiophore of powdery mil- dew. Fig. 213. A pycnidium. Redrawn after Quartance and Shear. the pathologist, for they may reveal a vulnerable point of attack in the life history of the parasite. Bacteria, physiologically, are much like fungi, but their bodies are single-celled and not threadlike (Fig. 214). They are very small, — one of ordinary size is about mm. long (^ inch); yet they multiply with such rapidity (one produces a progeny of

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