1912] Goodspeed: Nicotiana Hyhrids 123 



3. Growing Conditions — Soil and Climatic Conditions 



All three varieties have been cultivated continuously from 

 the years named up to the present time in practically the same 

 situation and under similar conditions. Constituting a part 

 of a considerable collection of Nicotiana types that has been 

 accumulated during the past ten years under Professor W. A. 

 Setchell's direction and for experimental purposes, this species 

 has received the special care universally accorded material propa- 

 gated for research work. The only portion of the Botanical 

 Garden at the present time available for experiments in plant- 

 breeding — suitably fenced and near a small propagating house 

 and cold frames — is not well adapted to the most successful 

 pursuance of such experiments. The "inclosure" lies at the 

 lowest level of any part of the garden, is not well drained and 

 is much shaded at all hours of the day by eucalyptus trees 

 which exhaust much of the vitality of the somewhat fertilized, 

 natural adobe soil. 



Climatic conditions in Berkeley during the out-of-door grow- 

 ing season — May to December — are very fairly constant through- 

 out a given number of years. Extracts from the records kept 

 at the University of California observatory follow: 



