Fig. 3. fig. 7 is therefore adopted. This system belongs to thelarva of a Dytiscus seen at fig. 5 of the natural size. … Fig. 4. For the admission of air there are only two openings,both situated near the tail, which it brings to the surfaceof the water whenever it is necessary to take a fresh sup-ply. Fig. 6 is a magnified portion of the trachea, to 56 MICROSCOPIC OBJECTS. exhibit the spiral nature of its structure.…
Microscopy
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