490 ALLS: [VoL. XII. 
contemplated. I therefore began at once the preparation of the 
final dissections needed for illustration in such a publication. 
The work was hardly begun when I was obliged to discontinue it 
and all other similar work for several years. Mr. Jujiro Nomura, 
who was attached to my laboratory as artist, and who was simply 
to have made the drawings from my dissections, then undertook 
to make the dissections also, under my direction. On this work 
he has been engaged continuously since that time, accompany- 
ing me from place to place, where considerations of health have 
obliged me to go. The length of time he has been engaged on 
the work only proves but too well that it has been no simple 
matter, even where the number and position of the nerves and 
muscles were definitely known, to find them, trace them to their 
origins, and lay them bare zz sz¢w, sufficiently clean and clear for 
a drawing to be made of them. 
As the work has progressed it has repeatedly been found 
necessary to study details, and to include in the investigation 
whole subjects, not contemplated in the beginning. The work 
has, accordingly, gradually lost the preliminary character it 
was intended to give it, and has become a somewhat extensive 
memoir. It nevertheless, in its general conception and arrange- 
ment, still retains many of the characteristics of the prelim- 
inary work originally contemplated, for it remains, as it was 
intended to be, an accumulation of facts and references grouped 
so as to be conveniently used as a basis for further work. 
The drawings used in illustration are all by Mr. Nomura. 
They all represent actual dissections, made mostly by Mr. 
Nomura, but continually controlled by me, not only on the 
dissection itself, but also by comparison with the results 
obtained in my own earlier work both on the adult and on 
serial sections of larvae. Nothing is shown in the adult that 
was not controlled in larvae, and everything found in larvae 
has been sought for until found, or accounted for, in the adult. 
Most of the drawings represent conditions found in a single 
fish, but certain of them are combinations of dissections made 
on two different heads; such combinations being made only 
when the results so given could not possibly be misleading. 
Whenever there has been the slightest doubt as to any arrange- 
