54 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 
Kingsbury in particular, we are under obligation for many 
courtesies throughout the whole progress of the exhibition. 
I. The first section of the exhibit consisted of a series of speci- 
mens of the soft-shell clam, mounted in cases under glass, and 
showing the rate of growth of the clam as determined by the in- 
vestigations of Kellogg and Mead during the last three years. 
The specimens exhibited varied in size from those hardly visible 
to the naked eye up to those whose shells measured over three 
inches in length. The special interest in this exhibit consisted in 
the illustration of the variation in the rate of growth among clams 
reared in different parts of the Bay, and under various other 
different conditions; the size which the clam attained at maturity, 
the size of the clam when a year old, and the size of the clam, 
reared under favorable conditions, at the age of a year and a half. 
II. The next series illustrated the growth of the scallop from 
about two months old to the age of eighteen months. The princi- 
pal interest in this collection is the demonstration of the so-called 
line of growth in the scallop—a mark which appears clearly upon 
the shell when the scallop has attained the age of one year—and 
which therefore is an important feature, because, at a glance, one 
may be sure whether scallops taken for market are less or more 
than one year old. This, again, is exceedingly important, because 
the scallop breeds only once, and that when it is about one year 
old. This demonstration, therefore, is of practical importance in 
connection with the efforts which are being made to stop the 
illegal catching of scallops for market before they have had a 
chance to breed. 
III. This series of specimens was prepared to illustrate the 
experiments of this commission in conjunction with the United 
States Fish Commission in the artificial propagation of lobsters. — 
It consisted of a series of specimens of the growing lobster, begin- 
ning with the fry which had been newly hatched and were less 
than a day old. The subsequent stages illustrated by these speci- 
mens represented a large number of the successive stages up to 
the time the lobster is a year and a half old. The more important 
