Introduction vii 



the Gulf. The botanical collections were very extensive and contained 

 many new species. The cacti of many kinds have been included in the 

 great monograph of that family recently published in sumptuous form 

 by the Carnegie Institution of Washington. 



The general character of the localities visited and the progress of 

 the work at each anchorage are commented upon briefly in the first paper. 



CHARLES HASKINS TOWNSEND. 



