ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



79 



hang on its stem. When racked down and the focus found, the chain 

 can be drawn taut by turning the adjusting screw at the bottom. 

 The coarse adjustment is thus deprived of further extension downwards, 

 while the fine adjustment is left quite uncontrolled. The protection 

 given by the first form is the more reliable as the fine adjustment is 

 limited also. 



For a somewhat similar device see this Journal 1904, p. 114, where 

 a " Focusing Safeguard " devised by S. E. Dowdy is described and 

 illustrated. 



5TAC£ 



T 

 3 



B 

 Pig. 11. 



New Epidiascope.*— VV. Freiherr of Wieser has designed some im- 

 provements in Zeis?' epidiascope for the purpose of producing episcopic 

 projections of very large objects. His desire was to make the apparatus 

 capable of showing the corpse of a fully grown person, and he has been 

 quite successful in attaining his purpose. 



Simple Method for Obtaining Photomicrographs.!— K. Hulds- 

 schinsky describes a simple and inexpensive method of obtaining photo- 

 micrographs when a projection apparatus is not at hand. He uses for 

 this purpose Leitz' drawing apparatus (fig. 12), which consists of a 

 small mirror obliquely placed over the tube of the Microscope ; fchemosl 

 convenient light-source being Leitz' hand-regulated arc lamp, and the 

 picture to be drawn being projected on to a sheet of paper near the 

 Microscope. For the paper, however, the author substitutes a photo- 

 graphic plate. He screens off the whole light-field between mirror and 

 plate with black paper, and, furthermore, confines the light within a piece 

 of black cardboard inserted so as to enclose object, objective and Abbe 

 condenser. The screen-paper might be replaced by a cardboard box. 



* Anat. Anzeig., xlv. (1913) pp. 21-31 (4 figs.). 



t Zeitschr. wiss. Mikrosk., xxx. (1913) pp. 206-7 (1 fig.). 



