78 REPORT—1849. 
as much (3805 and 2394 units). Phosphorus, on the contrary, gives less 
heat with chlorine than with oxygen (2683 and 4509 units). On comparing 
the quantities of heat disengaged by different bodies in combining with the 
same volume of chlorine, it will be found that potassium disengages a larger 
amount of heat than any other body hitherto examined, twice as much as 
zinc, and nearly four times as much as tin, antimony or copper. 
Combinations of Bromine and Iodine.—The heat disengaged by the same 
body in combining with bromine is less than with chlorine, and with iodine 
less than with bromine. The greater development of heat in the case of 
chlorine is at least partly due to that element being in the gaseous state be- 
fore combination. In some early experiments, I observed that the quantities 
of heat developed on converting equivalent solutions of the sesquichloride, 
sesquibromide and sesquiiodide of iron into the corresponding proto-com- 
pounds were equal. When a solution of protochloride of iron is converted 
into sesquichloride by agitation with chlorine gas, a definite disengagement 
of heat occurs, as also in the formation of the sesquibromide of iron by the 
combination of the protobromide and bromine; but in the corresponding re- 
action between the protoiodide of iron and iodine, no change of temperature 
can be observed. 

Report of the Committee on the Registration of the Periodic Phenomena 
of Plants and Animals, consisting of Epwin LANKESTER, M.D., Mr. 
R. Tayyor, Mr. W. Tuompson, Rev. L. Jenyns, Prof. HensLtow, 
Mr. A. Henrrey, Sir W. C. TREvELYAN, Bart., and Mr. Peacu. 
Since the last Meeting of the Association, your Committee have made 
several alterations in the Tables for the purpose of registering the periodie 
phenomena occurring in plants and animals, which were then submitted for 
the approval of the members. These tables have been sent to upwards of fifty 
members of the Association and others, who have undertaken to observe. 
But few of these tables have yet been returned to the Committee, but they 
hope at the next meeting to find more abundant fruit of their labours. They _ 
have to acknowledge, however, the receipt of a very complete registration of — 
the periodic phenomena of the plants and animals in the neighbourhood of — 
Swansea, by Matthew Moggridge, Esq.; also observations on periodic phx- 
nomena for 1848, at Polpero in Cornwall, by J. E. Couch, Esq, ; a list of | 
the visitation and departure of birds at Llanrwst in Wales, by J. Blackwall, 

Esq.; and observations on the foliation and defoliation of plants, by T.L. — 
Lloyd, Esq. 
Ninth Report of a Committee, consisting of H. EK. Strickuanp, 
Prof. DAausEny, Prof. Henstow, and Prof. LinDuLEy, appointed 
to continue their Experiments on the Growth and Vitality of Seeds. 
Dunrine the past summer, a portion of each kind of seed collected in 1841 
and 1846 were resown at Oxford and Chiswick, together with a few other 
kinds contributed by Miss Molesworth, of Cobham Lodge, Surrey. ; 
Those forwarded to Cambridge arrived just after Mr. Murray (Curator of 
the Botanic Garden there) had started for a botanical tour in the north, and 
he did not receive them till his return, when it was too late this year to have 
them sown. A statement respecting them will therefore be given in the Re- 
port for 1850. 
