22 i SUMMARY OF CURRENT RESEARCHES RELATING TO 
height on the adjoining box. All the parts of the apparatus can be 
packed away within a box 38 by 22 • 5 cm. and 9 * 5 cm. high. 
The apparatus allows a magnification of 4-75 diameters. j 
Fig. 5G. 
Hammarberg’s Object Net Micrometer.*— Dr. Hans Berger, of Jena y 
gives an account of the instrument invented and described by the late 
Dr. Hammarberg, a Swede, in his work on the pathology ’of idiocy. I he 
* Zeitschr. f. Instrumentenk., 1899, pp. 303-10 (3 figs.). 
