18 
Tasue III: 
Showing the Month in each Year, from January, 1843, to 
December, 1849, in which the greatest and least Quantity 
of Rain fell in Dublin ; the Month whose. mean Quantity 
of Rain is greatest being placed first, and the others in rank 
of their mean Quantity of Rain. 
October,. . 
August, ... 
J anuary, wok 
2s ee 
November,. . 
July, . 
June, ... 
December, . . 
September, . 
Mavi tie. 
March, 
February, . 
The numbers indicating the greatest monthly fall of rain 
in each year are underlined. 
The monthly mean varies from three inches to an inch and 
a half. 
Professor Allman read a paper on the reproductive sys- 
tem and development of the gemme in Paludicella articulata. 
‘* All the fresh-water polyzoa produce true ova, which are 
formed in a definite organ or ovary. From the existence of a 
