ARTIFICIAL PROPAGATION OF FISH. 501 
[11 
description. The outer portion, which is necessary to support the frames 
with glass-sticks (which here take the place of the hair-frames), is not 
seen in the drawing. The dimensions of the different troughs or ves- 
sels which compose this apparatus are as follows: Length, 0.52 meters 
breadth, 0.15 meters; depth, 0.10 meters. 
be iw 
i : -- i i il 
cons 
He 
Fic, 11. 
These troughs, which have been in use for a long time in Detriotds 
Germany, are placed in different ways according to the fancy of the 
operator. The hatching apparatus of the College of France, repre- 
sented in Fig. 12, will show the utmost use to which this apparatus 
has been put. 
i i i — = rays =, au sii ly hy 
iH i | i iy all Me re y, iy — Pr aes 
rc pry 
lt Lf Loy Ie lit . 
Ine | Zs ae alll Mee i Ni (in i 
: Vio | —— i. i i Ti 
i yA ae 3 eo a 2 
i I 
ai me i ga aa 
= = 
ll uu 
————— 
SS 
SSS 
SOFT 
———— 
E— 
= 
\ ry 
\\ 
1 Y < 
EEE 
| 
| in i es 
Fic. 12. 
The incubating apparatus is placed under a shed, supplied on all sides 
with hatches opening outward. 
These openings are intended to let air 
