100 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
removed and replaced by a small table provided with supports for the 
hands. 
(3) By turning the ring, the mirror passes from the horizontal to 
the vertical plane, and it is possible thus to reproduce beneath the same 
weak lens any object placed vertically in front and to reduce it to any 
extent required. The small frame in front of the prism is for the 
reception of convex or concave glasses for the correction of parallax, or 
for tinted glasses intended to equalize the illumination of the object 
and the paper. 
Nachet’s Compressor. — The advantage of the model shown in fig. 
9 is that all the points of the object are compressed equally owing to 
the two surfaces of glass being parallel to one another. 
New Microscope-Lamp as Safety Burner.* — Herr P. Altmann 
describes a new lamp for heating drying ovens, &c., which in point of 
* Centralbl. f. Bakteriol. u. Parasitenk., xii. (1892) pp. 786-7. 
