64 Proceedings of the Royal Physical Society. 



nants of the mouth of the invertebrals) , occupy the sella tur- 

 cica, the ethmo-frontal forming the labrum, the sphenoid 

 and presphenoid the mandible, the parietal and wormi-otic 

 the maxilla, and the occipital the labium. The haemaxis 

 runs along the upper part of the segment above the visceral 

 cavity. 



In the vertebrate classes, the relation of these axes is 

 inverted. The neuraxis, above the intestinal tube, which 

 is no longer found to pass through a ring in the neuraxis 

 after the vertebral kaulon has been interposed, and the 

 hsemaxis in the visceral cavity on the ventral aspect. 



III. Notes of a Fireball (or supposed Aerolite) recently observed near 

 Auchterarder, Perthshire. By John Alexander Smith, M.D. 



In the beginning of the month of February the following 

 notice appeared in the Edinburgh newspapers 



" Aerolite. — A few days ago, while Lieutenant- Colonel Hunter of 

 Auchterarder was out taking a walk over his estate, he saw an aerolite 

 descend upon the farm of Drumtersal, occupied by Mrs M'Ewan. The 

 sun had just gone down, and the sky was clear at the time. He 

 describes its appearance as strikingly beautiful, exhibiting a most 

 brilliant light, not unlike a red-hot twenty-four pound ball. It fell slowly 

 to the ground, and at the same time a larger body passed over to the 

 north east, in the direction of Trinity Gask. The Colonel, who was 

 within a few hundred yards of the one which fell, marked the place of 

 its descent, and it was got two days thereafter by his gamekeeper. At 

 the place where it was found, the grass was burned up for a few inches 

 around. It is now at Auchterarder House. It weighs upwards of ten 

 ounces, and appears to have been detached from a larger mass. Another 

 aerolite is said to have fallen near Stirling on the same evening." 



Lieutenant-Colonel Hunter has since favoured me with 

 more correct details of the fall of this fire-ball. It occurred, 

 he informs me, on Tuesday, the 27th of January, at five 

 minutes to 5 p.m. The clay had been beautifully bright with 

 sunshine ; the sun, however, had set for eighteen minutes, 

 but it was still full daylight, when his attention was attracted 

 by the descent of a luminous body, which was most brilliant. 

 Its fall was nearly perpendicular, and had all the appearance 

 of a hot twenty-four pound cannon-ball. It fell apparently 

 towards a lea field ; and Colonel Hunter's gamekeeper, who 

 happened at the time to be at some distance off in another 

 direction, also saw it fall apparently in the same field ; and, 



