274 
and some columns are left blank to show that they are still desirable.? 
The pentads or decades to be used in such a table as this should 
always be those introduced by Dove, the limiting dates of which are 
as given in this table; the twelfth pentad of the ordinary year has 
five days, but that of the leap year has six days, so that the limiting 
dates are always as here given, viz, from February 25 to March 1, 
inclusive. The data given by Descroix in the Annuaire for 1890 con- 
sist of the mean values for the respective pentads. From these I have 
constructed the sum totals from January 1 to date, which are needed 
in agriculture, and which are still more easily obtained when we have 
the original tables of observations at hand, by simply taking the 
sums in a continuous series and avoiding the labor of computing the 
means. From such a table of sum totals we obtain the sum between 
any two dates by subtracting the sum for the earlier from that for the 
later date. 
aThe omitted columns are: (1) Sunshine; actual duration. (2) Actino- 
metric degrees; actual daily average. (8) Ratio of actual actinometric degrees 
to the maximum possible daily average. (4) Soil temperature at the surface. 
(5) Soil moisture. (6) Percentage of saturation. 
