I MICROSCOPES. 927 



3656a. Dr. Klein's Section Knife. T. Hawksley* 



3657. Moist Chamber. T. Hawksley. 



3658. Series of Glass Canulae, and Nozzles. Dissecting 

 Instruments, Forceps, Scissors, Hooks, &c. 



T. Haivksley. 



3662. Preparations of normal anatomy of the human body, 

 injected and varnished, in 1809, by Prochaska. 



The microscope and preparations were given by the author to 

 the first Baron Larrey, with the description in Latin that is 

 affixed to the instrument. Baron Larrey, Paris. 



3662a. Microscopic Section Cutting Machine, with 

 Freezing Cell. Harvey, Reynolds, and Co. 



3662b. Williams' Freezing Microtome. J. Stvift. 



3663. Microscopical Double Knife, constructed by A. 

 Stelzig, surgical instrument maker in Prague. With flexible 

 curved blades. Compared with knives of older shapes, the paral- 

 lelism of the edges is to a much greater extent preserved in this 

 form. 



The Imperial and Royal Pathological and Anatomical 

 Institute of the University of J'rague (Director, Prof. 

 Edwin Klcbs). 



3664. Valvulotome. An instrument for making incisions in 

 the valves of the heart, being a straight catheter, at whose front 

 extremity, which is rounded, a small blade is attached, which by 

 means of the screw inside the instrument can be opened, so that 

 the free rounded end will project more or less. The edge of 

 the knife is turned towards the catheter. After the introduction 

 of the instrument into the jugular vein, or the carotid artery, the 

 right or left ventricle of the heart can be easily reached. The 

 blade having been protruded, the chordas tendinece of the heart 

 are grasped and cut off by pulling the knife backwards into the 

 catheter. Artificial disorders of the heart so produced have been 

 observed for more than a year, and the circulation studied on 

 cymographical curves. 



(Prague Weekly Journal, 76. No. 2.) 



The Imperial and Royal Pathological and Anatomical 

 Institute of the University of Prague (Director, Prof. 

 Edwin Klebs], 



3665. Microscopical Warm Stage. The constant equality 

 of the temperature is obtained by the increased bulk of the thick 

 copperplate. The object is placed in the recess, and the centre 

 aperture is closed by a glass disc. A broad, thick copper ring 



