1036 



RECORD OF CURRENT RESEARCHES RELATING TO 



Hailes' Poly-microtome.* — This instrument, shown in Figs. 110 

 and 111, is the design of Dr. W. Hailes, Professor of Histology, &c., at 

 Albany Medical College (U.S.A.), who thus describes it: — 



This instrument is designed especially for use in the working 



Fig. 110. 



Poly-microtome (without freezing apparatus). A, small well, fitting on 

 pyramidal bed-plate. B, pyramidal bed-plate, containing different sizes. C, 

 micrometer screw. D, ratchet-wheel attached to screw. E, lever actuating 

 the micrometer screw by means of a pawl engaging in teeth of ratchet-wheel. 

 F, arm, carrying a dog, which prevents back motion of screw. G, regulator for 

 limiting the throw of lever, and consequently governing the micrometer screw. 

 H, lever-nut for fixing regulator. I, index, with pointer and graduated scale, 

 from ^^o inch to -s-tio iii<^h. K, knife for cutting sections. L, knob to turn 

 micrometer screw direct when pawls are attached. M, table-clamp. T, table of 

 microtome, with glass top to facilitate cutting. 



laboratories of medical schools and colleges, where large numbers 

 of sections are required for microscopical examination. It may be 

 employed as a simple instrument or as a freezing microtome, arranged 

 for ice and salt — ether spray, phigoline, &c. 



The employment of ice and salt (coarse) is preferred, because it 

 costs but little and freezes the mass solidly and quickly, and, if 

 desired, 500 or 1000 sections can be obtained in a few moments. 



* 'Science,' i. (1880) p. 187. (2 figs.) 



