34 



ETON NATUKE-STUDY 



same plant structures. A kammatograph is employed, which is an 

 apparatus intended to take a number of photographs on the same 

 plates with considerable rapidity, and to exhibit them again after- 

 wards at a high speed so that movements may be reproduced. 

 Plants only occasionally move quickly enough for the changes in the 

 position of their parts to be perceptible, but the kammatograph 

 forms a convenient way of taking a number of photographs from the 

 same spot at frequent intervals, without disturbing the camera,* and 

 what is more, the pictures taken at considerable intervals can when 

 projected on the screen be made to move rapidly. 



* Mrs Scott's methods were described by her in " The Annals of Botany," volume XVII. 

 (September 1903), but since the above was written, a popular article by her has appeared 

 in " Knowledge and Scientific News" (May 1904). 



