ZOOLOGY AND BOTANY, MICliOSCOPY, ETC. 
781 
they may be accommodated by removing the drawer next above and 
placing but two slides in each drawer at, right angles to the position 
occupied by three, the springs thus coming to the centre. Being made 
entirely of copper, the durability of the apparatus is assured as well as 
its safety from rust. 
Mr. Preston adds that the object of the rack is to allow the ready 
removal of the entire lot of slides from the oven without the necessity of 
taking the oven as well. 
Slide Carriage and Object-finder.* — Mr. F. L. J. Boettcher, finding 
it very difficult to get on without an object-finder, has constructed a 
contrivance whose object is twofold ; first, to bring every part of the 
Fig. 103. 
section by the shortest route once and once only under the Microscope ; 
and secondly, to enable any point in the section to be recorded. In 
fig. 108 A represents a slide 3 in. bv 1 in., lying in a recess or hollow of 
the carriage B, into which it fits closely and is held by the clamps a «. 
* Amer. Mon. Micr. Journ., xiv. (1393) pp. 200-2 (1 iig.). 
3 h 2 
