PHOTOGRAPHY OF BACTERIA. 



157 



in the vertical position, while the illumination is supplied from an 

 oxyhydrogen lantern. 



To place the apparatus in the vertical position two small hinged 



brackets, at the end distant from the camera, are forced up with 

 a smart blow of the hand. The corresponding ends of the stretcher 

 bars are dislodged from their fittings, and allowed to descend ; when 



