PHENOLOGTCAL RECORDS. 69 



From the following lists such varieties can be readily selected. In 

 each case the general conditions which are given, under which the 

 observations have been made, will assist the reader in making the 

 necessary correlations in formulating his deductions. For instance, 

 if a variety of plum at 200 feet elevation blossoms on a certain date 

 and another variety at 1,000 feet elevation blossoms on the same 

 date, it would not be safe to conclude that they would be suitable 

 for cross-pollination, since when grown at the same altitude, other 

 things being equal, it is doubtful if they would blossom in the same 

 sequence. Other factors require similar consideration in interpreting 

 the records. 



The following list of observers, with their locations, indicates the 

 points at which observations have been made, and due credit is 

 given for the assistance thus rendered. The column at the left of 

 the page, marked "Observer's number," contains the number by 

 which each observer is referred to in the tabulation of phenological 

 data on later pages. 



In the following tabulation the varieties are arranged alphabetically; 

 under each variety the locations at which the observations were made 

 are arranged geographically, according to the latitude, the first entry 

 under each variety being the southernmost point at which observa- 

 tions were recorded. 



The numbers in the column marked "Observer's number," at the 

 left of the page, correspond with the numbers in the similar column 

 under "List of observers." By referring to this list, the place at 

 which each record was made and the name of the observer can be 

 readily determined. 



In many instances the duration of the varieties has been reported 

 in general terms; hence, it has been necessary in compiling the data 

 to assume some specific date as the limit of durability. Therefore 

 the dates appearing under the heading "Keeps until — " should be 

 understood to indicate the durability of the varieties only approxi- 

 mately, but as this quality is so influenced by conditions external 

 to the fruit itself, a liberal interpretation is necessary in any case. 



135 



