The nucleation of the uncontaminated atmosphere . CF 39 9 F 96 8 F 85 9 F 49 10 C 86 9 SnR 33 10 F 45 11 F 80 10 FC 42 11 R 15 12 Sn 67 11 F 81 12 CF 40 13141516 Sn 62 12 CSn 82 13 C 23 F 82 13 R 44 14 F 57 FC 90 J4 F 92 15 F 53 CF 81 15 F 61 16 C 26 17 FC Sn 79 16 F 88 17 CF 60 18 CF 43 17 C 81 18 C 41 19 20 CF 7584 1819 FF 8183 24 f 55 21 CF 76 20 Sn R 65 25 F 41 22 C 85 2t F 73 26 CR 47 23 24 C 56 22 C 32 27 C 15 C 32 23 F 79 28 CF 12 2526 FC 6762 2425 CF 78 293° CFC 2826 27 R 48 26 C 55 May 1 FFF 31 28 RF 74 27 F 80 2 57 28 F 5i 3 52 31 F 69 Mar. 1 F 65 , NUCLEATION AT PROVIDENCE AND BLOCK
The nucleation of the uncontaminated atmosphere . CF 39 9 F 96 8 F 85 9 F 49 10 C 86 9 SnR 33 10 F 45 11 F 80 10 FC 42 11 R 15 12 Sn 67 11 F 81 12 CF 40 13141516 Sn 62 12 CSn 82 13 C 23 F 82 13 R 44 14 F 57 FC 90 J4 F 92 15 F 53 CF 81 15 F 61 16 C 26 17 FC Sn 79 16 F 88 17 CF 60 18 CF 43 17 C 81 18 C 41 19 20 CF 7584 1819 FF 8183 24 f 55 21 CF 76 20 Sn R 65 25 F 41 22 C 85 2t F 73 26 CR 47 23 24 C 56 22 C 32 27 C 15 C 32 23 F 79 28 CF 12 2526 FC 6762 2425 CF 78 293° CFC 2826 27 R 48 26 C 55 May 1 FFF 31 28 RF 74 27 F 80 2 57 28 F 5i 3 52 31 F 69 Mar. 1 F 65 , NUCLEATION AT PROVIDENCE AND BLOCK ISLAND. 127 86. Average daily nucleations.—These are given in table 61, togetherwith the date and the weather. They are further shown in the chart,figure 102, where the abscissas denote the successive days and theordinates are the corresponding nucleations in thousands per cubiccentimeter. The different points are distinguished by the usualWeather Bureau symbols, Q 3 0 , r, Sn, etc., so that the weatherconditions are included in the Fig. —Average daily nucleations in thousands per cubic centimeter at Providence(upper curve) and at Block Island (lower curve, excepting the data markedwith a circle, which were taken at Providence) for November, 1904, to May,1905. This curve is quite distinct from the types obtained in 1902-3 and1903-4 and shown in my earlier report,* inasmuch as the new curvehas an incidental strongly marked maximum in February. Otherfeatures, however, appear as in the earlier figures. Thus, there is adefinite tendency to reach a maximum in December. * Smithsonian Contributions, Vol. XXXIV, 1905. 128 NUCLEATION OF THE TJNCONTAMINATED 62.—Average monthly nucleations. Providence. Block Island. Ratio. Month. n X 10-3. n X 10-. n jn. 53-° «7-o)7-i 9-7 January ... * May 40-3 5-4 13-9 7-9 5-0 <(5-i) *The February effect, which is merely superimposed at Prov
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