PLATE 38. 



Instantaneous Photomicrography. 



A Daphnia pulex x 20 



B Cyclops quadricornio ? x 18, dark ground illumination 



Photographed from living specimens by means of the apparatus 

 described on page 247. 



Objective Swift 1" Achromat. 



Ocular Swift No. 2. 



Condenser ... A. Watson's Universal Achromat, top lens 

 removed. 



B. Abbe, with wheel stop. 

 Illuminant ... Liliput 4 amp. arc. 

 Aux. Condenser Biconvex lens, parallel light. 



Plate Imperial Special Sensitive. 



Exposure A. J-^. sec. 



B. ; sec. 

 Developer ... Pyro-soda. 



These are two minute crustaceans belonging to the group 

 Entomostraca. They abound in ponds and ditches and swim very 

 actively. Dapliniais known as the "water flea." Cyclops is so named 

 from its possession of one single cluster of ocelli only. The individual 

 photographed is a female with two egg sacs attached; in these the ova 

 undergo the earlier stages of their development. 



C PORTION OF CINEMATOGRAPH FILM OF LIVING TRYPANOSOMES OF SLEEPING 

 SICKNESS AMONG BLOOD CORPUSCLES x 400 



Dark ground illumination. 



Photos. A and B, W. B. R. 



C, Messrs. PATHE FRERES. To follow page 248. 



