22 TRICHOLOGIA MAMMALIUM; 
by the union of as many filaments. We find them chamfered, but that they are formed 
by the union of 20 or more filaments, we are unable to confirm, and yet would not like 
positively to deny. We made many transverse sections, which were examined under the 
microscope, with the view of ascertaining if any such union exists. Sometimes, especially 
where the section is made in the neighborhood of the furcation, separate portions of the 
shaft may be seen; but they are not homogeneous in shape, as it seems to us they ought 
to be if they were an union of filaments; but, on the contrary, have the appearance of the 
fibres of other furcated pile. We separated one bristle throughout, into as many portions 
as there were furcations. Upon exposing these to view under the microscope, the sides 
that had been exterior could easily be detected by their smooth appearance, while those 
that were originally the interior were covered with ruptured fibrils. (See fig. 14.) 
Cuvier says, also, that each bristle has two canals, one for the marrow and the other a 
humor. We could not find them. 
EXAMINATION AND DEscRIPTION OF A BRISTLE oF A Russtan Witp Boar.—Length 9% 
inches; diameter 45 of an inch. Color of the button, brown; of the shaft, white, and 
transparent for the distance of 3 inches, and opaque for the rest. Button in length, <35 
of an inch; diameter, '5; posterior termination, quill shaped; shaft, chamfered. Apex 
very much furcated. 
Comparison oF DIMENSIONS OF ELEVEN VARIETIES OF BRISTLES, SELECTED FROM OUR 
CoLLECTION.— 
No. 1, French, black. Length, 11 5% inches. Diameter, 4 of an inch. 
white. se eyes ‘ 7 sith &e 
ee aes wh GG 9 at 6 “ ay ce 
Lass (Olay é 6 34 ‘ « Je 
‘A, Russian, “ 6 33 «“ “ a “ 
“ 5, German, & 5 sb “ “« aie « 
oe 16, Mt UG 5 “ ‘ oor ‘ 
ee a OIG. i 4 55, ‘“ «cc ae & 
«“ 8, French, “ A & te a &e 
“ 9, Flanders,* 6 See & 6 ie & 
“ 10, Wild Boar of Russia, s i) ‘és ée ae ‘“ 
“11, Okakla of a «6 5 4 « & 1 ‘ec 
10 52 
From the above it appears that the French bristle is the longest, but that of Ohio is the 
stoutest. 
Ductilty, Elasticity and Tenacity of six Varieties.— 
No. 1. One inch submitted to the trichometer May 28th, 1749. 
With 1,070 grains it stretched 4 of an inch, elasticity entire. 
a3 4,466 a3 sy (74 ce 
6c 9,000 73 30 ce oe 
ae 10,000 ce 4 (74 “e 
* Very much esteemed for paint brushes. 
