820 



SUMMARY OP CURRENT RESEARCHES RELATING TO 



which carries also an oxyhydrogen lantern. In order to photograph micro- 

 organisms in liquids or the colony growths in gelatin which has heen 

 partially liquefied, the apparatus can be placed in the vertical position so 

 that the stage is horizontal. 



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 dis- 

 lodged from their fittings, and allowed to descend ; when horizontal, the 

 opposite extremities of the bars are easily released from their sockets. 

 The leg or support at this end can then be turned up and fixed underneath 



Fig. 226. 



the apparatus by a button, and the end of the apparatus itself gently lowered 

 to the ground. A hinged end-piece is also to be turned out to increase the 

 base upon which the whole apparatus will stand when raised to the vertical. 

 The two-legged support at the opposite end of the apparatus is next worked 

 down by a quick thread screw, and, on raising the apparatus to the vertical, 

 the two-legged support drops to the ground, and assists in maintaining the 

 stability of the whole. If it be thought necessary, a simple means can be 

 readily devised for clamping the apparatus in either position to the wall of 

 the room, so as to eliminate as much as possible all chances of vibration. 

 A second quick thread screw moves the base-board upon which the camera 



