155 
Monpay, JANUARY 8TH, 1855. 
THOMAS ROMNEY ROBINSON, D.D., Prestvenr, 
in the Chair. 
Tue Right Hon. Francis Blackburne; Richard G. Butcher, 
Esq.; James H. Owen, Esq.; and Edward Senior, Esq., were 
elected Members of the Academy. 
On the recommendation of the Council it was Resolved :— 
I. To place the sum of £50 at the disposal of the Com- 
mittee of Antiquities, for the purchase of antiquities. 
II. That permission be given to the Council to exchange 
with Mr. Anketell a modern representation of the Crucifixion, 
made of ivory, and not Irish, now in the Academy’s collec- 
tion, for one made of bronze, and probably of great antiquity, 
and of native manufacture. 
Rey. Joseph Galbraith read a Paper by Capt. H. L. Renny, 
C.E., on the Use of the Hygrometer in the Barometric Mea- 
surements of Heights. 
Dr. Allman read a Paper on the existence of a true me- 
dusoid structure in the male gemme of Hydra. 
In this communication the author endeavoured to demon- 
strate that the peculiar spermatophorous tubercles which are 
developed upon the body of Hydra at the commencement of 
winter, possess a true medusoid type of structure, and thus 
form no exception to the general law which he had already 
enunciated, that the fixed reproductive capsules of the hydroid 
zoophytes are constructed on the medusoid type, and that for 
