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short periods are adyantageous in the handling of large numbers of samples. 

 After preliminary investigations a compromise between short and long ex- 

 traction periods was adopted in the present study. All samples were first 

 extracted with acetone for six hours followed by benzene for three hours. 

 Those samples from genera of interest vhLoh yielded a benzene extract in 

 excess of 0.5^ of dry weight from this preliminary test were analyzed again 

 with extraction periods of 20 hours. The analytical procedures were as fol- 

 lows: 



In the preliminary analysis two grams of the ground material in a folded 

 filter paper was placed in a Whatman paper thimble and extracted on a Gold- 

 flsch apparatus with acetone for six hours. After air drying for at least 

 24 hours the material was extracted with benzene for three hours. Acetone 

 extracts were dried at 100°C for three hours and benzene extracts were dried 

 at 100°C for two hours. Moisture determinations were made by drying separate 

 one-gram samples of the plant material in a vacuum oven at 100°C for five 

 hours. The acetone and benzene extracts were then calculated on a percentage 

 diry weight basis. 



In the second long-period analyses the determinations were made in dup- 

 licate. Approximately two grams of the ground material was placed in a mois- 

 ture dish, dried for 16 hours at 70 C in a vacuum oven to remove the residual 

 moisture, weighed, transferred to a folded filter paper, placed in a paper 

 thimble and extracted on the Goldflsch apparatus with acetone for 20 hours. 

 After being dried in air the sample was extracted with benzene for 20 hours. 

 Extract drying times were the same as used in the preliminary analysis. 



RESULTS 

 Acetone and benzene extracts from the preliminary short-time analyses 

 together with the collection locality, date of collection, and name of 



