kaeakoram stones, or SYRiNGOSPiRERnKE. 7 
fence. e s * ze °t the radial and interradial series is apparently of specific impor- 
sonie of wlii sec ^ ons tire pores are seen to be spaces surrounded by interradial tubes, 
But i h ° Pen ° n tHe floor - 
a Ver y scanty 0 Fat ^ a ^ sec *i° ns °f tliose types which, have a great number of radial series and 
Hot so strikin'* SU ^ 10Unc ^ n a reticulate tubulation, the appearances under the microscope are 
tion occurs g ^ m the ° ther ins ! ances ' In these tIie radial, cone is very long, and bifurca- 
a Ppear to be n ni ^ ai ' a ^ vc ly scantily, so that it is narrow, and the sides of the series often 
rounding serie -’ t-l' ^ ^ lc tubes of the radial series, moreover, are smaller than the sur- 
ably straio'Pj- m are n °t so c ^ ose together side by side, and their course is almost invari- 
they bend so 1° ln ^ erra ^ a ^ surrounding tubes are closer and larger than the others, and 
l °st to sio. 1,1 aS , ° P res ent oval or geniculate knots, the continuity of the tube being often 
an d touch her 01 °? lme denotin S the upward or downward bend. They bend laterally also, 
other, So aiK there and bifurcate. The size of this series is usually larger than the 
dark on es< ‘ 1U t lcse radial sections a radiating series of light lines is separated by broader 
^his 
some ST4 stru °turc is best seen in the group without pores, but it exists in the other, 
In one t S ’ Plate IIIj Fi S- 6). 
j n ^ j^ )e of the Syringosphceridai the pores are very developed, especially equatori- 
ex tend in Sections their presence is evident in the body or from the surface. They 
are situated°^ f leG - ail .^ es ° ne outsi(ie the other, and evidently bound radial series, but they 
sll °otg of tb e PlS • the interradial. On either side of them are elongate tubes, off- 
u hhin outwa 0 ^ • 1 ° n ^ n ? Ser ^ es ’ an< t separating one space from another; that is to say, from 
a tabula of V \ a Pia< ta e of cross and reticulate tubes parallel with the circumference, like 
quite at il!'V r0CaraP ® everal °t these bridges exist, and the last one is incomplete, 
tub 
the 
in 
n q u p fi , * oeverai oi inesc onuges exist, ai 
In fano- f - le , surf f ce where a pore is about to be occluded 
ns. &en la t sec tions, the circular outline of the pores x 
In 
Presen 
pores may be seen surrounded with 
essence SP f eClmens ’ . this absence of tube-structure along definite lines, that is to say, 
spaces bp , pores, is not so visible, but they can be detected as vacant pits or circular 
No Z P Wl,h extraneous material. 
Tli e tubes / U ^°- S eu ^ er the pores. 
P( ; en already^ °, rmia ^ both series are continuous, bifurcating, and inosculating; and, as lias 
c ges or siq es » Cet ’ somo are in the main straight and others are curved and form the 
The tubes > ^ ieatei> or less meshes or vacant spaces. 
|° *hi inch in di G niUCl> larger in some ^Pes than in others, and they range from T ^ 00 - inch 
>at frequently i ameter ’ they usually retain the same caliber for some distance or altogether, 
°j*ginal cylijwi..; 1 * *° me types they swell out, become varicose, flat, and again return to their 
l sho °ts usually a i C ? nClltl0n ' , ( Plate ni ’ higs. 6, 8.) The union of tubes is by small 
<|Ual size to fui ’ Ut tlle bifurcation, often at an acute angle, gives origin to two tubes of 
The tubes h Par6nts or nearl y so - 
lo 'U (} °f the consti^ a an( ^ a ^ umen ’ an ^ the thickness of the wall varies; moreover, 
Und the tube* m U6Uts ° f P ass Regularly into the caliber, as well as occasionally sur- 
oes tike a furry investment. 
1 Syringospharia porosa, Duncan. Plate III, Fig. 3. 
