Transcription:
4 larger individual drops are formed and these spread out in space, forming the cloud mass. If the necessary fall in temperature
occurs, the cloud drop becomes a drop of water, bound for earth. I have tried to put the process of cloud building before
you in simple language. We know very little about it. Some day men will know a great deal about it; but always there will
be more yet. It has always been a wonder to me that men were content to know so little about clouds. I remember spending
one night with Campbell in the some of the Lick Observatory. He plugged along until early morning getting stellar spectrograms,
on a problem that he has been at work on for years. It is all to try to find out how the solar system is moving in space.
And I remember thinking that if as much effort could be put into the study of a drop of rain or a drop of dew, the results
would be just as marvelous and of as great value to mankind. Some day I hope there will be a big observatory for the study
of a dew drop. I don't know if I have met your wishes. I have a great manyphotographs of clouds and want you to see them
whenever you can find time. With warmest regards,Sincerely, Alexander G. McAdie Professor 04734