Badania doswiadczalne nad przeobrazeniem ocuadoiv. 
Experiments on metamorphosis of insects . 
Note 
de M. STEFAN KOPEC, 
présentée, dans la seance du 5 Février 1917, par M. E. Godlewski fils m. c. 
In these experiments larvae, respectively moths of Lymantria 
dispar L. were used. 
1) The removal of the nervous ganglion of a segment in larvae 
does not provoke either degeneration or atrophy of the muscles 
of the corresponding division of the body, although the animals 
spent sometimes,. in such postoperative conditions, 0'7—08 of 
their life. 
In adult insects, the presence of the ganglion in a segment is a 
necessary condition of the existence of the corresponding muscles. 
(Some exceptions which were observed are to be considered as 
due to the ingrowing of nerves of a neighbouring ganglion into 
the operated part). Instead of muscles, under these circumstances, 
we observe some adipose tissue and a microgranulous substance 
which becomes strongly coloured by the use of eosine. The hy¬ 
pertrophic growth of the tracheae and of the intestine of the seg¬ 
ments devoid of muscles bears witness to mechanical correlations 
which exist between the growth of the organs and the space given 
to their development. 
2) The larval feet of the abdomen regenerate quite normally 
notwithstanding the absence of central ganglions and of pedal nerves. 
3) After the removal of the larva’s brain, the eye of the imago 
develops normally up to the minutest details of the macroscopical 
and histological structure. Nor does the size of the eye change. It 
develops well even when, together with the brain, we remove the 
