[i]
[ii]

[iv]

[v]

PREFACE

To the meteorologistI hope the following pages may prove not only of some interest, butof practical value as a small step towards that greater exactnessof language which is essential before we can attempt to explain allthe details of cloud structure, or even interchange our ideas andobservations with adequate precision. The varieties depicted anddescribed have been selected from many hundreds, as those which seem tome to show such differences of form as to imply distinct differencesin the conditions to which they are due. I have not attempted to dealwith the physical causes of condensation except in a general way,being unwilling to introduce diagrams of isothermals and adiabaticsand such purely scientific methods into a work also intended for awider public. For those who wish to pursue this part of the subjectI have appended a list of papers from the[vi] Quarterly Journal ofthe Royal Meteorological Society and other sources, which mayserve as references. I also hope that some more votaries of the sciencemay be induced to realize that meteorology does not consist solely ofthe tabulation of long columns of records, but includes subjects forinvestigation as much more beautiful as they are more difficult.

To the artist I trust they may also be of some use, by callingattention to the variety and exquisite beauty of the sky. Nothing ismore extraordinary in art than the general negligence of cloud-forms.Many of them are quite as worthy of careful drawing as the leaves of atree, the flowers of a field, the ripples on a stream, or the textureof a carpet, or a marble pavement. Yet it is the common rule to findpictures, which are otherwise marvellous examples of skill and care,disfigured by impossible skies with vague, shapeless clouds, as untrueto nat

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