448 Mr. H. N. Moseley on the [Apr. 6, 



movements which follow the administration of the bile-acids. I choose 

 one of five experiments nearly all alike. 



Dec. 19th. — The anterior cerebral hemispheres of a frog, leaving the 

 optic thalami uninjured, removed. The foot was irritated by being 

 plunged in water made just perceptibly acid to taste by sulphuric acid. 

 The numbers are in seconds. 



12.22. 12, 6, 7, 8, 6, 7, 6. 



12.32. -5 cubic centimetre of bile-acid solution injected under the skin 

 of the back. 



12.39. 1, 2, 1, 1, 29, 27, 15, 16, 21, 28, 22, 26. 



The head cut off at 1 o'clock. 



1.25. 9, 9, 9, 9, 10, 10, 10. 



In all cases a minute passed between the application of the irritant, 

 and the foot was well washed with distilled water after each observation. 



From these observations it would appear that the reflex irritability is 

 greatly diminished by the bile-acids. 



In conclusion I wish to express my best thanks to Professor Burdon 

 Sanderson, P.R.S., and to Dr. Lauder Brunton, P.R.S., for their great 

 kindness in giving me invaluable advice and assistance throughout the 

 research. Many of the experiments were made in the Jodrell Labora- 

 tory at University College, London, under Professor Burdon Sanderson's 

 eye ; and the remainder were made in the Pharmacological Laboratory of 

 my friend and colleague Dr. Lauder Brunton, at St. Bartholomew's 

 Hospital. 



III. "On the Structure of a Species of Millepora occurring at Tahiti, 

 Society Islands." By H. N. Moseley, Naturalist to the 

 ' Challenger ' Expedition. Communicated by Prof. Wyville 

 Thomson, F.B.S., Director of the Civilian Scientific Staff. 

 Received March 6, 1876. 



(Abstract.) 

 In a paper treating mainly of the structure of Heliopora ccerulea, 

 communicated to the Boyal Society in the autumn of 1875, some account 

 was given of results arrived at from the examination of two species of 

 Millepora obtained at Bermuda and at Zamboangan, Philippines ; and 

 in that paper a summary of the literature concerning the tabulate corals 

 generally was given. The present paper, to be considered to a certain 

 extent a continuation of the last, gives an account of the structure of 

 a species of Millepora obtained at Tahiti, Society Islands. The author 

 commences by expressing his obligations to his colleague Mr. J. Murray, 

 who obtained living specimens of the Millepora and handed them over 

 to him with the zooids in the expanded condition for examination, and 

 who further, having devoted some time to the study of the coral, gave 

 him valuable information with regard- to several points in its structure. 



