Datura sanguinea R. and P., its seeds

Abstract

The seeds of the Peruvian plant Datura sanguinea R. and P. contain hyoscine and are used in Peru as stramonium is used in Britain. Their structure is described and is compared with that of the seeds of stramonium and of D. fastuosa with a view to their identification either unground or in powder.

The causes of tattering of flags under natural conditions

“…It is possible that better results might have been obtained hadthe sampling period been s h o r t e r than 6 weeks, or if the 'test' data had been collected in a period other than winter months. Wallis (1965) states that the principle justification for generating prediction equatious is the expectation that further sets of observations of the predictor variable will become available. By compaJ:ing m e a s u r e d and predicted values it is possible to a s s e s s the validity of the prediction equation.…”