Gi 
3 da) yr dp \? dp 
Te dee ————— MRT;.| —— Ie rot. 
ght paid 2 0°» jr : Gee) die 
(MRT). HW 
v® 
der, der, TA gen d1 apl 
he or 20: ==, or ——— ==, from which we 
So that for «—0O qT AT a a C 5 
dp... pz, : ape? 
easily derive that also ae so that in the p7-diagram the 
i aw Ax 
point of contact curve and the plaitpoint curve touch at the ends. 
We find further that with the same wv: 
(37) 
3 Ox 5 Op? 02 2 
Raa ees! TRS MEN, Aar (OAN 
f 2 0*p dp 0a) oT Oxdv Jr 
(ety (a 
dv? J\ dvd Tl’ 
from which p,,— pr, can be easily found. 
If, as in Communication N°. 75 (Proceedings Nov. 1901), we 
introduce the law of corresponding states, we find: 
Physiology. — “On the structure of the light-percepting cells in the 
spinal cord, Oll the neuro fibrillae mn the ganglioncells and O1 
the innervation of the striped muscles in amphioarus lanceolatus.” 
By Dr. J. Borkn. (Communicated by Prof. T. Pracr). 
In connection with a former note?) I mean to describe here some 
points of the histology of the central and peripheral nervous system 
of amphioxus lanceolatus, especially to follow the neurofibrillae in 
their arrangement and distribution in the cells and in the muscle-plates. 
This paper is the outcome of observations begun in 1900 in the 
Stazione Zoologica at Naples, but then not carried any farther, to 
study the structure of the pigmented cells of the spinal cord. During 
') Proceedings of the Royal Academy of Amsterdam. Meeting of April 19, 1902. 
