ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



597 



angle and in any position. The object-holder is the Naples universal 

 clamp. The vertical motion of the feed-screw is transmitted to the object- 

 carrier through a triangular prism. The object once adjusted, cutting is 

 effected by backward and forward motion of the carriage. The feed 

 ranges from 1 to 60 microns. The knife is bilaterally symmetrical in 

 section, the edge is straight, and the handles by which the knife is 

 clamped to the frame are continuations of the blade itself and have the 

 same angles. 



Minot Automatic Rotary Microtome.* — In this instrument (fig. 126) 

 several improvements have been made, and increased accuracy Las been 



Fig. 126. 



obtained by means of better tools for planing the sliding surfaces, cutting 

 the micrometer screw, and cutting the teeth of the feed-wheel. Other 

 improvements have rendered the microtome more convenient to use, the 

 most important being alterations in connection with the automatic feed, 

 the addition of a brake, the provision of a split nut for the micrometer 

 screw, which closes automatically, and more careful balancing of the 

 main wheel. 



Microtome for Cutting under Water.f — Dr. J. Starlinger describes 

 C. Reichert's microtome for cutting under water. The body is made 

 out of cast iron, and the smaller parts are nickel-plated. The most im- 



* Bausch and Lomb's Cat. B, 16th ed., pp. 8 and 9; also Journ. App. Microscopy, 

 iv. (1901) pp. 1317-8. 



t Zeitschr. wisa. Mikr., xvii. (1900) pp. 435-40 (3 figs.). 



Oct. 16th, 1901 2 s 



