. Annual report. New York State Museum; Science; Science. REPORT OF THE DIRECTOR IO,IO 231 a new table (table 6) in the following manner. The distance of 1 from the orad angle of the IB as measured on the vertical suture of figure 12 ( mm) has been used as a minuend; the distance of the 2 from the same point or angle of the IB ( mm) has been taken as a subtrahend; the difference between these numbers, the remainder, ( mm) has been entered as the first member of the new table. Taking 2 and 3 and treating them in the same manner, we obtain a remainder of mm and e
. Annual report. New York State Museum; Science; Science. REPORT OF THE DIRECTOR IO,IO 231 a new table (table 6) in the following manner. The distance of 1 from the orad angle of the IB as measured on the vertical suture of figure 12 ( mm) has been used as a minuend; the distance of the 2 from the same point or angle of the IB ( mm) has been taken as a subtrahend; the difference between these numbers, the remainder, ( mm) has been entered as the first member of the new table. Taking 2 and 3 and treating them in the same manner, we obtain a remainder of mm and enter this as the second member of the table. The other differences expressed in the table were found in a similar manner. The two numbers before any sign "of equality designate the whose dis- tances (from the orad angle of the IB) were used for minuend and subtrahend. left diagonal next suture and the to appear right diagcr the next b ial suture an .v. to appear d -3 (1-25- -6 ( .70- ) = - .60) = .IO 3~ 6- -4(1 -7( ?15— .60— ) = — •75) = - •15 15 Table 6 Giving, for an aborad radial group, the difference between distances from the orad angle of the IB (expressed in mm) of a on the vertical suture and the next to appear 1—2 (—) = 2 4—5 (i-30— .70) = .60 5 7—8 ( .75— .30) =s .45 8—9 ( -30— .30) = .00 To quickly, clearly and visually explain table 6, let us take a hypothetical orad radial group. The are to appear in sequence with a time interval that shall be the same for all. The addition of stereom to the aborad sutures of the basals are supposed to be constantly and regularly in excess of the amount added to their com- mon vertical sutures. This will result in increasing the length of the plate more rapidly than the width. Let us suppose the ratio between verticle and lateral rate of extension to be as 4 to 3. Then when 1 has increased its dis- tance from the orad apex of an IB by 4 units, b
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