ZOOLOaT AND BOTANY, MICROSCOPY, ETC. 



651 



described. Its speciality consists in attaching the camera to a rod which 

 is extensible in a socket (with a clamp screw), by which means the 

 camera can be made to fit any Microscope, whatever its height. 



Plossl's Focusing^ Arrangement.— Messrs. S. Plossl apply to their 

 photomicrographic camera the fine-adjustment shown in fig. 107. 



Fig. 107. 



This is practically a very large form of the Jackson fine-adjustment, 

 the lever which raises and depresses the movable nose-piece being actuated 

 by a large rod with a " Hooke's joint," the handle of which is at the end 

 of the camera. 



It appears to us (without having practically tested the point), that 

 the enormous leverage of the focusing rod must add greatly to the 

 difficulty of focusing. 



Instantaneous Photomicrography.* — Sig. S. Capranica comes to 

 the following conclusions as the results of his experiments on instanta- 

 neous photomicrography : — 



(1) Eapid photography 1/20 of a second, or very rapid 1/200 of a 

 second, can be obtained with the photographic Microscope if very high 

 powers and immersion lenses be used. 



(2) By means of a special shutter and a particular arrangement, any 

 number of successive negatives of the movements of an object can be 

 obtained just as, macroscopically, the flight of birds, and the rapid move- 

 ments of other animals (Marey, May bridge, &c.), have been. 



(3) By the method of successive positions, the author has succeeded 

 in reproducing upon the same sheet the different planes of any prepara- 

 tion, obtaining thus a photograph unique in its entirety. 



The author particularly calls the attention of microscopists to the 

 results noticed in (2), as they are entirely new and susceptible of 

 numerous and important applications in the study of the Infusoria and 

 of all living micro-organisms. 



KiTT, T. — Ueber MikrophotograpMen. (On Photomicrographs.) 



Oesterr. Monatschr. f. Thierheilk., 1888, No. 6, 18 pp. 

 MiJLLEE, N. J. C. — Atlas der Holzstructur dargestellt in MikrophotograpMen. 

 (Atlas of wood structure represented in photomicrographs.) 



21 pis. and 60 figs., 4to, Halle, 1888. 



* Journ. de Microgr., xii. (1888) p. 227. 



