NOTES AND EXHIBITS. 119 



clay. Also a branchleb of a Casuarina growing on a sandhill 

 near the beach at Corriraal, remarkable for the fact that the 

 rudimentary leaves, instead of being arranged in whorls, formed 

 a spiral extending the whole length of the branchlet; the grooves 

 following the same spiral (spiral torsion). Sections for the 

 microscope of the spiral branch, and of a normal branch were 

 also exhibited, showing that the fibrovascular bundles as well as 

 the scierenchyma were also arranged in a spiral manner, instead 

 of straight up and down the branchlet. 



