OR, A TREATISE ON PILE. 133 
It also is sometimes required to stretch a hair, and allow it to contract again, while under 
examination microscopically ; to effect which no information is given im the instructions 
how to use the microscope. We have invented and constructed a very simple instru- 
ment, by which both these objects can be. attained. 
7 Sig. 95. 
Upon an oblong piece of glass, A A, A A, of the size of a common slide, fasten two 
pieces of cork, B B, one at each end of the glass. Through a perforation in the centre, 
crosswise of each cork, at the surface of the glass, pass two sewing needles, C, the eyes 
being inward and the points projecting a short distance outside of the cork. Fasten the 
ends of the hair, D, desired to be examined, on the eyes of the needles. When this 
instrument is placed on the object-holder of the microscope, the ends of the keeper resting 
respectively upon the corks, and the microscope is adjusted so that the hair comes into 
focus, by taking hold of the outer ends of the needles, you may turn the hair in any 
direction and to any extent of a revolution required. And by gently drawing the end of 
one needle, or both of them, you may stretch the hair while under examination, and by 
pushing back the ends of the needle or needles, allow it to draw up again to its original 
dimensions. 
We propose to call it “a@ hair revolver and stretcher.” 
OF Descrininc Pite.—By adopting some order in which pile is to be described, we 
incur less risk of omitting something which ought to be noticed. The following is recom- 
mended :— 
1. Name, and short description of the animal. 
Name and address of the donor of the specimen. 
General appearance. 
Length, (noting whether it is natural or artificial.) 
Shape. 
Diameter. 
Color and lustre. 
Direction. 
Inclination, 
10. Ductility, elasticity and tenacity. 
11. Button—the dimensions and description. 
12. Sheath, Be os 
13. Follicle, es us 
14. Shaft, se ‘“ 
BS ae 
So 
