578 Scientific News. : (June, 
in the first instance only the external layer is sloughed off, and 
that between this and the next following horny layers there is a 
definite contrast.” As we have seen, the distinguished Würzburg 
embryologist has expressed doubts not iustified by the facts, 
there being an external layer which is extremely different from 
the horny layer, and is apparently a true epitrichium. _ 
The human epitrichium, so far as I have observed, is. devel- 
oped quite late, about the fourth or fifth month, though to be 
sure an enlargement of the outermost epidermal cells may be 
observed earlier than this. 
Karyvoxinesis.—In the study of karyokinesis in the arthropods, 
Professor J. B. Carnoy! obtained the best results with the two 
following mixtures: 
(1)? Chromic acid (2 p, c. or more) iio ace see 45 parts. 
Osmio Seid (2 D. Cpe te 6 os eno sc eam krr reprenet 
MSACIAL ROCHIC BONE... won canada yas en shan sha tes el 3 
(2) Corrusive sublimate 
lacial acetic acid (1 p.c.). 
The object (testes) is left from six to ten minutes in one of oe 
mixtures ; then washed in distilled waters and further hardened! 
alcohol. 
:0: 
ae SCIENTIFIC NEWS. 
=< —Edward Tuckerman, professor of botany in Am pad 
lege, died March 15, aged sixty-nine years. He was a gra Salk 
_ of Union College (1837), of Harvard College (1846), of ee pret 
vard Law School (1839); studied history, philosophy and bota 
herst Col- 
i n 
iLa Cytodiérése chez les Arthropodes, p. 211. (Extrait de la Revue « La Cellule, 
‘I, 2o fas., Louvain, 1885.) 
3 Modified form of Flemming’s mixture. 
