HELLISH — SERPENTS OF PRINCE EDWARD ISLAND. 103 



mum of pressure corresponding to the least and greatest heat of the 

 day. 



The point that I wish especially to urge, as bearing upon nearly 

 all the inhabited portions of the globe, is the dynamic force of vapour 

 affecting the atmosphere at fixed hours of the day, acting indepen- 

 dently although it may be at times assisting the static density of the 

 air. In storms and any atmospheric disturbances these regular tides 

 disappear — shrouded by the greater temporary forces then at "work 

 — but at those periods they are of great use to the observer in his 

 forecasts. For instance should they still be appreciable in bad 

 weather, the disturbance is certainly local and short lived. On the 

 other hand, should the barometer fall, even slowly and to a small 

 extent during the morning — say between sun rise and 9 o'clock — a 

 serious disturbance will surely ensue, while if the barometer rise 

 during midday, between 9 a. m. and 3 p. m., you may count at 

 least on a fine night, with the sole exception of the accompaniment 

 of an east wind, which fair or foul raises our Atlantic coast barom- 

 eters. This, in itself, is a subject worthy of investigation ; but 

 to-night I will not longer try your patience, but conclude with thanks 

 for vour attention. 



Art. VII. — Notes on the Serpents of Prince Edward 

 Island. By John T. Mellish, M. A. 



{Read May 8th, 1876.) 



F amilt-Colubrid^e . 



Genus — Eut^enia 

 Eutcenia Sirtalis. Baird and Girard, 

 Coluber Sirtalis. Linn. 



Garter Snake. 



6re»«S-BASCANlON. 



JBascanion Constrictor. B. & G. 

 Black Snake. 



