4. Stratus lenticularis (Plate [47]). Fall cloud.
Formed by the collapse of cumulus or strato-cumulus. A cloud of evening, easily recognized as lenticular patches. S. L.
5. Strato-cumulus (Plates [38] and [39]).
A term applied to either a stratus which has thickened every here and there into cumulus, or a number of cumulus which have joined together so as to show a nearly continuous common base. S. Cu.
Group Cumulus.
1. Cumulus minor (Plate [43]). Small cumulus.
Cumulus clouds so small as to present the appearance of rounded lumps, no definite pyramidal form or flattened base. Cu. Mi.
2. Cumulus major (Plates [44] and [45]). Large cumulus.
Characterized by a flattened base and rounded clear-cut upper surfaces. Cu. Ma.