Stratus. S.
Fracto-cumulus. Fr. Cu.
Fracto-nimbus. Fr. N.
Fracto-stratus. Fr. S.
Stratus-cumuliformis. S. Cf.
Nimbus-cumuliformis. N. Cf.
Mammato-cumulus. M. Cu.
During our survey of these groups we have found that some of them include clouds of many shapes, which must be due to very diverse conditions. It follows that if observations are to be made on the occurrence of these special kinds, with a view to arriving at a thorough understanding of the circumstances to which they owe their forms, it becomes necessary to devise a code of names and symbols whereby an interchange of ideas and records may be rendered possible. Specific names have been proposed as each form was considered, and it only remains to sum them up concisely. Subsequent observation, particularly in other climates, may show that further additions should be made; but if the principle of specific names be once admitted, it will be easy to fill any omission.