THE GANNET'S ANATOMY 523 



the abdomen {see " British Birds," IV., p. 419). Mr. 

 C. B. Ticehurst has supphed the following note on a dis- 

 section made at Lowestoft, October 10th, 1911 : "Adult. 

 Patellae osseous, tendons of wings and legs not so. Exten- 

 sive subcutaneous air-sacs extending from clavicle down 

 over breast and abdomen to pubes and round to sides ; 

 also sacs under sternum and between the pectoral muscles, 

 and between these muscles and the sternum. These sacs 

 communicate with the lungs through channels where 

 the bronchi break up (on each side) into a honey-comb 

 tissue ; entrance (from within) to the large subcutaneous 

 air-sacs is just outside the coracoid and close to the tendon 

 of the pectoralis minor, between that tendon and the nerves 

 and vessels which supply the pectorals. The pectoralis 



so that the attempt was a complete failure. But the same thing 

 had already been tried at Paris by Mile. F. Bignon, with a con- 

 siderable measure of success, as appears from the results which she 

 communicated to the " Societe de Biologic " (" Comptes Rend, de la Soc. 

 de Biol.," 1889, p. 90). Therein she fully confirms the opinion, already 

 advanced by another anatomist, M. Boulart (" Jo urn. d'Anatomie et 

 de Phys.," XVIII., p. 467), as to the complete separation of the cervico- 

 cephalic sacs. But the investigator who has advanced the furthest, 

 although his attention was not directed to the Gannet, has been Mr. 

 Bruno MiiUer. He experimented entirely on Pigeons, and tells us that 

 he made use of paraffin and gelatine (10 per cent, coloiu'ed with Berlin 

 blue or carmine). He first placed the bird in formol, and for some days 

 injected formol with gentle pressure through a canula into the trachea, 

 and thence into the air-sacs, which became hardened in a moderately 

 distended condition (" Smithsonian M.C.," TV., p. .SO.")). 



