Bulletin, Gulf Biologic Station . some cases, yet it must be remembered thatthese results are estimated counts,-the total being determinedfrom the actual count of a certain proportion. Thus it is, thatdifferences will arise, even if a second estimate be made froma second count of a single towing. On the whole, the num-bers indicate that there cannot be very much difference in thetotal number of larvae in the water, and that the towings rep-resent tolerably uniform conditions. Since then, the larvae are found in greatest abundance dur-ing May and June. It naturally follows that the greatest num
Bulletin, Gulf Biologic Station . some cases, yet it must be remembered thatthese results are estimated counts,-the total being determinedfrom the actual count of a certain proportion. Thus it is, thatdifferences will arise, even if a second estimate be made froma second count of a single towing. On the whole, the num-bers indicate that there cannot be very much difference in thetotal number of larvae in the water, and that the towings rep-resent tolerably uniform conditions. Since then, the larvae are found in greatest abundance dur-ing May and June. It naturally follows that the greatest num-ber of spat will settle during those months. Consequently cleanshells planted during those months will be most likely to gatherspat. Actually, however, there are enough young in the waterduring April to be sure of a favorable set. Moreover, shellsplanted in April are not apt to become fouled so soon as thoseplanted later in the season; since the fouling growth reproducesand increases more abundantly when the water is warmer. Al-. V.—A TYPICAL OYSTER DREDGE boats are flat-bottomed, and, with the stern-wheel drive, can maketheir way over very shallow water. Notice the bumpers on the bow for push-ing the flat. Under ordinary conditions, it takes a crew of nine men tohandle a boat of this size, and the running expenses amount to about twentybarrels a day. 13 though our observations are not very extensive along these lines,it has been observed from those who have actually planted shellsthat the best results can be gotten by laying out the beds inApril or early in May. Remember, that at the critical times inthe life of the young oysters, that is, when it settles down afterbeing a free swimming animal, the oyster must attach itself tosomething, if there is nothing but mud, it is smothered, and ifbottom is covered with foul growth consisting of the enemies ofthe oyster larvae, it is eaten up. The point is, to have the ma-terial used for collecting spat free from foreign g
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