Aggregation of plasmodia into aethalium, [92] f.

Agitation, stimulus of, [19] f.

Aglaophenia, [276], [279]

Aglaophenopsis (Plumulariidae, [279]), [277]

Aglaura, [294]

Aglauridae, [294]

Aiptasia couchii, [382]

Air, presence of Flagellate spores in dust of, [118]

Air-borne germs in relation to putrefaction, etc., [43]

Alate, [185]