1S89.] 



MICROSCOPICAL JOURNAL. 



83 



animal. These forms were not found among the floating mats of Os- 

 cillaria on the surface, but were at the bottom of several feet of water 

 amono- the PIe?irosi<2'ma and other diatoms and in detached filaments. 



NOTES ON APPARATUS. 



The King Microtome. — -This microtome, by J. D. King. Edgar- 

 town. Mass.. will cut anything that can be cut with any microtome, and 

 do its work as well as the best, but it is designed especially for botan- 

 ical work, or for cutting any hard substance that requires the greatest 

 possible rigidity in the instrument. 



The knife is attached to a heavv nickel-plated iron carriage. A. by a 

 steel clamp and shoe, b and c. with milled head-screws, a. The car- 

 riage runs on a solid iron track, h and B. which is held to a table by a 

 clamp-screw, k. 



For cutting very hard objects, like the wiry stems of plants, or the 

 chitinous skeletons of insects, there is an attachment with a very stout 

 blade, on the principle of a carpenter's plane, d. which screws on to the 

 carriage in place of the knife, and like the knife it can be used straight 

 across or obliquely. 



Diameter of well, /, ^ of an inch : depth of well, i;^ inches : depth 

 of well with chuck, Z. i inch. 



For cutting soft material, paraffine mav be cast directl}- into the well. 

 or into a chuck, not shown, which is held firmly by being screwed into 

 the bottom of the well. The adjustible chuck. L. is intended for harder 

 material. 



Microtome Xo. i gauges to i-io.ooo of an inch bv turning the ratchet. 



' u I u ummmiiiiuiumifflifl^^ 



(Cut about one-third actual size.) 



