PROCEEDINGS 
PERTHSHIRE SOCIETY OF NATURAL SCIENCE. liii 
4.—To all Ordinary Members who are not in arrears with their 
Subscriptions a copy of the Society’s Transactions for the year shall 
be sent fret of charge. 
In addition to the Ordinary Monthly Meetings, a special course 
of Four Lectures was delivered by the Rev. F. Smith on 15th, 22nd, 
and 29th November and 6th December, 1888, on “The Functions 
and Phenomena of Rivers (particularly of the Earn and Tay).’’ 
The following was the Synopsis of the Lectures :— 
LECTURES I. and II.—What the Rivers are now Doing. 
I.—The Earn as a type—Its situation and character—What it is now doing— 
The material with which it works—Its modus operandi —The rate with 
which its work is done—The valley terraces. 
II.—The Tay—It is doing the same work as the Earn, but in more dignified 
proportion—Its terraces are higher, in accordance with its greater flooding 
power—Why it is becoming shallower—A history of the origin of the site 
of Perth. 
LECTURES III. and IV.—What the Rivers have done in the Past. 
III. —The Forty-feet Terrace—Its clayey nature—The origin of its clays—The 
ancient extended estuary—Dr. Milroy’s “Names of Places and Physical 
Phenomena ” — A magnificent (triple) parallel; historical, geographical, and 
geological—The descent of the Rivers upon the old estuary floor. 
IV. — The Devon Valley Flood — Its phenomena, and the light such phenomena 
throw upon the history of the Rivers in the past — Accumulative and 
Dispersive periods of River work — The result as now exhibited in the 
Tay Valley. 
SUMMER SESSION, 1889. 
The following Excursions were arranged :— 
1. May 23.—To Linn of Campsie and Banks of Tay. 
2. June 8.—To West Bank of Tay, from Murthly to Birnam, and 
back by the East Bank. 
3. June 22.—To Laird’s Loch, Coupar-AngUs, and by Dunsinane 
to Errol. 
4. July 6.—To Luncarty, by Bankfoot and Glengarry, and thence 
to Birnam. 
5. July 20.—To Meal-Chuirn (3007 feet). 
6 . August 3.—To North Bank of Tay, from Ivenmore to 
Aberfeldy. 
7. August 17.—To East Bank of Tay, from Dunkeld to Dalguise, 
and back by West Bank. 
8. August 29.—To Machany Burn, Muthill. 
