INTRODUCTION 27 



screen, with one camera running all the time day 

 and night for the season, was only about ten minutes 

 total result on the screen, and I was always needing 

 the camera for out-of-door pictures showing the 

 flowers in their natural habitat, when my only cam- 

 era would be tied down on a long run on some slow 

 opening flower in the laboratory. 



The first crude camera had long since gone into 

 the discard, one made to order taking its place, then 

 a Pathe, followed shortly by an Ackley which proved 

 ill-suited for my special work and which was too 

 heavy for field work. The Professional Bell and How- 

 ell, costing about $2,400, was the ideal equipment 

 for the laboratory and field if the location could be 

 reached by car or horse. Then the spring motor- 

 driven hand camera came out and the Bell and 

 Howell Eyemo made it possible to reach the more 

 inaccessible places on foot, but the camera for my 

 special kind of work has not yet been put on the 

 market. It must have a way of focusing on the aper- 

 ture on subjects within one or two inches of the lens. 

 It must have an adjustable shutter, giving control of 

 the width of the shutter opening, and it must have 

 motor spring, crank and one-to-one drive and be 

 within reasonable weight limits. It is hardly possible 

 enough camera men would want a standard size 



