372 The American Naturalist. (May, 
organic centrum, it will be considered questionable in the 
description of tissue cells or the bodies of the Protozoa, 
whether the nucleus should not be considered as the centrum. 
‘Schulze thinks that in such cases a distinction should be made 
and an additional compound term framed which would 
express the difference between the artificial and natural points 
‘or axis, etc. Thus the nucleus would be the “ nucleo-cen- 
trum” however excentric its position. | Undoubtedly in this, 
as in other cases, it is of advantage to make comparisons 
between the imaginary morphic centre and the organic cen- 
tre, since while these are often the same they are not coincident 
in many forms and the use of a double set of terms will oblige 
observers ‘to note such phenomena in their descriptions. 
Nevertheless one cannot say without experience in practical 
. application whether a double set of terms would be advanta- 
geous or merely burdensome. (2). Die Syngrammen (ysa 
meaning line) the Centraxonia of Haeckel, bodies elliptical 
cylindrical, étc., pyramidal, etc., which may be considered as 
‘having their parts arranged around an imaginary central sey 
but having all sidesequal. This axis he calls “principal axis 
“both ends are styled “termini,” the surfaces immediately 
around the termini are “terminan” and the direction towa 
‘them “ terminad.” | 
Centrum, centran, centrad, are used as before for esi 
lying in the principal axis or in that direction. “Ax@n” 18 
employed for parts in the principal axis, when near to that line 
o“ proximal, ”* when directed toward it “axiad,” the region 
away from the principal axis is “distal,” the direction 18 
“distad” and the surface or periphery is “ distan.” = 
All planes or parts lying in planes going through the pr pi 
cipal axis are “ meridian, ” all parallel with these “ paramen™” 
ian.” The parts lying in the plane passing through the cen 
: i ” and ; 
tre at right angles to the principal axis are “transversan, © 
is open ose 
