Longeviti/ of Sct'd.s. 203 



Ki riioHiiiACKAK. Polygon ACKAE. 



Euplu)i-l)i;i Peplus Einex spiiiosa. 



Geuaxiackae. 8tkik;uliaoeae. 



Impatiens Balsaniiiia. Heiinannia aiigulaiis. 



Goodeniaceae. Tiliaceae. 



Scaevola Hookefi. Eiitelia arborescens. 



APPENDIX. 



The Occurrevce of an Impermeable Cuticle o)i the 

 Exterior of Certain Seeds. 



By jean white, M.Sc. 



(Government Research Scholar). 



VvTieuever possible, Professor Ewart passed on to me specimens 

 of those seeds which he found needed special treatment before 

 they were capable of imbibing water, and consequently swelling. 

 For the investigation of the cause of this impermeability a 

 method was adopted which was somewhait similar to that t--in-" 

 ployed by Bergtheil and Day in their researches on the 

 luu'dness of the seeds of Indigofera arrectay The great 

 majority of the seeds which exhibited this resistance were from 

 plants belonging to the family Leguminosae. In several of the 

 Malvaceae, the same phenomenon was observed, and also in a 

 somewhat doubtful case of a species of Chennpndium. 



,}fefhod of Er/perim entire g. — The seeds were soaked in water 

 for a time, varying from one to seven days. 



In the majority of cases none of the seeds swelled, thougti 

 commonly a small proportion did so. and in a very few instances, 

 practically all swelled, so that it was quite difficult to obtain 

 unswelled specimens for investigation. The unswelled seeds 



1 Annals of Botany, \ol. \\i , .Ian., 1907. 



