Dr Dickson exhibited a number of specimens, chiefly Fir Cones and Cacti, illustrating the principal series of vegetable spirals. Almost all the cacti and many of the cones were from the Edinburgh Botanic Garden and the Museum of Economic Botany there. As the nomenclature of the cacti in the Edinburgh garden, as in many other botanic gardens, is in a state of considerable confusion, the specific names will not be referred to, and the generic ones, even, must in some cases be held as only approximately correct.