THE VICTORIAN NATURALIST. 109 



for the sake of brevity, here omitted ; suffice it to say that 

 these operations are almost entirely similar to those used in 

 ordinary landscape photography, instructions for which can be 

 found in one of the many excellent handbooks on the subject 

 which abound at present. 



In conclusion, I may say that there is a large field open in 

 the direction of photo-micrography for anyone with enthusiasm, 

 patience, and a little spare time. As regards these latter, with 

 some objects a prolonged exposure of an hour or more is quite 

 necessary, under which circumstances one can frequently 

 adjust his apparatus and devote his attention to other recrea- 

 tions while the light does its work. 



DESCRIPTIONS OF NEW AUSTRALIAN PLANTS, WITH 

 OCCASIONAL OTHER ANNOTATIONS ; 



By Baron von Mueller, K.C.M.G., M. & Ph.D., LL.D., F.RS. 



(Continued.) 

 Hemigenia Tysoni. 



Tomentellous 5 leaves very small, simply opposite, lanceolate- 

 linear, channelled, short-pointed, towards the summit recurved, 

 from the axils often fascicled ; flowers solitary, nearly sessile ; 

 bracteoles much shorter than the calyx, generally rhomboid- 

 lanceolar ; tube of the calyx rather slender, obconical ; lobes all 

 nearly deltoid or the lower semilanceolar, about half as long as 

 the tube ; corolla bluish, outside upwards beset with scattered 

 hairlets, downwards glabrous, inside below the lobes barbellate ; 

 lowest lobe much dilated ; lateral lobes hardly half as long as the 

 lowest, somewhat longer than the upper, almost semielliptic, 

 upper lobes connate into a short-sinuate one ; connective of all 

 the anthers both ways elongated, of the lower glabrous, of the 

 upper barbellate at one end ; style and ovulary glabrous. 



On hills near Mount Narryer ; Isaac Tyson. 



Indument partially floccous. Leaves only yh-^i inch long. 

 Corolla measuring y^-Yi inch in length. Ripe fruitlets not 

 obtained. 



Might systematically be placed near H. curvifolia, but the 

 vestiture is shorter, the leaves are much smaller, the flowers 

 scattered, the bracteoles and calyx-lobes broader ; the comparison 

 of fresh flowers of these two species would doubtless reveal other 

 differences. 



Baron von Mueller has last month withdrawn from the 

 directorship of the International Academy for Botanic Geography 

 of Le Mans, as he disapproved of several of the measures 

 adopted there. 



