Pro. Roy. Soc. Q'land, Vol. xvi. 



Plate V. 



The Scale. 



Each small division represents a niillinietre, 



and is eijuivalent to a luicroii magnilied 1000 diameters. 



Actual rH0T0-MicROGi;APH. 



Part of a Zeiss Stage Micrometer divided into lOUtiis of a m m, 



ma''nitied 1000 diameters. 



ArPLICATIOX OF THE ScALE TO THE PhOTO-MICKOGR.\PH. 



