Letter from Daniel W. Kempner enclosing a check for $4.00 for pot sized ferns, and asks if they have any Farleynse Ferns.

Correspondence between D. W. Kempner and Southern Fern Growers, Inc. discussing how Kempner found their advertisement and was wondering if they had any Maidenhair or large leaf Farleynse Ferns, and if they did wanted to know the prices of them. Southern Fern Growing, Inc. responded that they did not have those varieties of ferns.

Correspondence between D. W. Kempner and John discussing how Kempner noticed in an advertisement for John's and asking to see if the company has Maidenhair and large leaf Farleynse Ferns, and if so the prices of them. John replied that they did not have any Maidenhair ferns, but enclosed a circular with what they do currently have.

From Introduction: "In the present paper, the variation of effective gust velocity in convective-type clouds with altitude is investigated. Data obtained during 1941 and 1942 at altitudes up to 34,000 feet and data obtained more recently from the Thunderstorm Project (reference 5) at altitudes up to 26,000 feet are utilized for this purpose. Consideration is given in analyzing the results both to data for the range