MADE AT THE PLYMOUTH LABORATORY. Oe 
During the following summer a number of young fish of different 
kinds were put into the same tank, and they have been fed and 
watched with some care ever since. ‘The following is an account of 
their growth and history. 
In June a few young turbot and brill in the pelagic transforma- 
tion stage were put into the tank. 
On July 5th a plaice 6°9 cm. (22 inches) was put in; it was taken 
in Cawsand Bay. 
On July 21st a turbot 3°5 inches long was put in, taken at 
the surface in the Sound. 
On July 28th I put in six plaice, 6°5 to 8°5 em. (24 to 38 inches). 
These plaice were judged to be of the brood of the year, 7. e. hatched 
the preceding January, February, or March. 
On September 2nd I took out one of the soles which was dead ; 
it was 9°6 cm. long, or 32 inches, and must have been not much 
more or less than six months old. 
On October 19th I emptied the tank and measured all the fish 
in it, The inventory was as follows: 
7 plaice: 7 cm. (2% inches), 12°38 cm., 12°8 cm., 13:0 em., 
14°1 em., 14°4 em.,_ 14-8 cm. (53 inches). 1 sole, 9°9 cm. long: 
3 brill: 8:0 cm., 8°5 cm., and 10°4 cm. 3 turbot: 6°5 cm., 9°5 cm., 
2°9 cm. 
There were also three pollack, about 12°3 cm. long, one red 
mullet and one bream, all young fish of the year. 
On April 4th, 1894, several of the fish died, in consequence of a 
temporary stoppage of the circulation. They were 1 turbot, 10°8 
cm. long (44 inches.) ; 1 brill, 11:3 cm. long (43 inches) ; 1 plaice, 
16:7 cm. long (6% inches). 
I have not been able to give sufficient attention to this tank 
during the past summer to record the size of each specimen that 
died init. I examined all the fish in it on December 31st, 1894, 
and found only the following remaining :—1 sole 14°7 cm. long 
(53 inches) ; 1 plaice 21 cm. long (81 inches) ; 1 plaice 18°5 cm. 
long (74 inches). 
This experiment is obviously a very small contribution to the 
study of the growth of fishes. Plaice, sole, turbot, and brill evidently 
do not bear confinement so well as flounders, and it would be better 
to have a larger number of specimens in a larger tank. Neverthe- 
less the results show observed sizes at known ages, and there can 
be no doubt that some fish in the sea grow no faster or slower than 
those. It is shown that a sole may reach from 32 to 4 inches when 
six months old, and may not exceed 5% inches when about twenty 
months old. Itis clear, therefore, that soles not differing much from 
A inches in length in spring are probably a year old. This year I 
