58 REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



about 50 mm. (2 inches), at the end of the second year 74mm. 

 (3 inches) and, when three years and four months old, 80mm. (3| 

 inches). The growth in the third j^ear was probably rather slower 

 than that of average clams under favorable conditions, for the con- 

 ditions were, in this case, not particularly favorable. 



The plotted curve, diagram II, represents the average size of 

 these specimens during three and one-half years. Fig. 13 is from a 

 life size photograph of the average specimens taken at intervals 

 during this time. 



Experiment No. 6. More than 20 bushels of very small clams, 

 averaging about 10,000 to the quart, were taken from the shore of 

 Green's Island in the summer of 1901 and transplanted in several 

 of the commission beds at various places. The growth of these 

 transplanted clams, and of those which remained at Green's Island,. 

 was observed from time to time. 



At the end of six months sample specimens w^ere taken from But- 

 tonwoods and from Rumstick. They exhibited a very noticeable 

 difference in their growth, those from Rumstick averaging 37.5mm. 

 (1^ inches), while those at Buttonwoods averaged 50.2mm., a trifle 

 over 2 inches. 



In January, 1903, when the clams were about a year and a half 

 old, those transplanted at Cornelius Island, Wickford, averaged 

 58.5mm. (2 5-16 inches); those at Mill Cove, Wickford, 63. mm. 

 (2 7-16 inches); those at Kickemuit River, 68.1mm. (2f inches); 

 and those left at Green's Island, 57.4mm. (2 j inches). 



When examined in the latter part of 1903, when the clams were two 

 and a third years old, those at Mill Cove averaged 85.3mm. (3f 

 inches), those at Kickemuit River, 91mm. (3| inches); and those 

 which remained at Green's Island, 76mm. (3 inches). 



The average length of these clams in all the experiments was for 

 the first half year 41.8mm. (If inches); for the first year and a half, 

 61.7mm. (2 7-16 inches); and for two and a third years, 84mm. 

 (3| inches). 



Experiment No. 7. The question is often raised — what is the 



