54 the president's address. 



low-power, medium, and high-power work, and these can best be 

 shown by a number of lantern photographs, which I shall have 

 great pleasure in exhibiting later. I particularly wish to direct 

 your attention to the fact that for quite low-power work the 

 microscope and the microscopic objective are not required. 

 Indeed, unless the instrument is specially constructed for such 

 work it is not advisable to use it, because the tube cuts down the 

 angle of the objective so very considerably. A first-class an- 

 astigmat of about 1 -in. focus, such as one of the following — Zeiss 

 Planar, Leitz's new objective, the Beck-Steinheil, and last, but 

 not least, a little gem, computed by a member of our own Club, 

 Mr. A. E. Conrady, with an unusually large flat field — should 

 be attached to an ordinary camera, and the object illuminated 

 in a careful manner, a condenser between the light and the 

 specimen being required in most cases. 



[The President then exhibited a long and highly interesting 

 series of photo-micrographs by means of the lantern, explaining in 

 detail their more important points and the apparatus employed 

 in their production. Some further remarks upon this exhibition 

 will be found in the " Proceedings." — Ed.] 



Joum. Quekett Microscopical Club, Ser. 2, Vol. X., No. 60, April 1907. 



