336 Proceedings of the Royal Physical Society. 
EartH THERMOMETERS, 
Read Daily at 9 a.m. | 
an | 
} 
| 
| Mean Temperature. Variability of Temperature. 
| 
Air * | 
| Bins. | 12ins.|22ins.| Temp. 3ins. | 12ins.| 22ins,|,Ait | 
at9A.M. Temp. 
| | 
° oO 9° °o ° | °o ° ° 
January, 38°38 | 29:7'| 39°9 | 410 | 24 | 08 | 0-5 | 5:2 | 
February, 20;05) 4150 bals2 415 | 19) | 0:65) Oss ean 
March, 40'2'| 40-2 | 41-4 | 433° | 20 | 06 | O03 | 2ae 
April; A67 | 467 | 45:6 | 49:4) (1:5 | 016 |) Oma aaa 
May, . 550 | 53:8 | 51-8 | 561 1:9 | 06 | O-4 | 4-9 
June, 57:8.) 57:5 | 55:6 | 568 | 1°8 0-7 | 0:4 4-5 
July, . 59°4 | 590 | 57-7 | 59:2 | 21 | 06 | O-4 | 47 | 
August, . Dal 1-9. | SF 2 oil | 4. 0:4 | Oro ual eae 
September, . 53°2 | 54°5 | 54-4 | 53:5 |. 17 03 0°3 33 | 
October, . 42-8 | 46-1 | 47-0 | 495 | 21 | 0-7 | 0-4 | 35 | 
November, . A0°5 | 42:2 | 42°6 | 41:6-| 2:3 | 0:6 | (04 acm 
December, . 373 | 39°2 | 40:1 | 385 | 19 | 08 | 05 | 36 | 
Year, | 47-4 | 482 | 47:9 | 48-4 | 19 | 06 | 0-4 | 41 | 
| | 
XXYV. Notes on the Mollusca of the Laminarian Zone at Leith. 
sy J. G. GoopncniLp, H.M. Geological Survey, F.Z.S., 
M.B.0.U. 
(Read 17th March 1897.) 
In studying the molluscan fauna of any marine area below 
tide-marks, the only means usually available for the purpose 
is by dredging. Much useful work can be done by such an 
instrument as the dredge, especially when it is in the hands 
of skilful and experienced operators; but at the best, one 
obtains by such means only a number of small samples of 
the material to be studied, which are gathered, so to speak, 
almost at random. The dredge is, therefore, by no means a 
perfect instrument of investigation when it is desired to 
study the molluscan (or other) fauna of any given marine 
area. It is only on very rare occasions that one has an 
opportunity of studying the mode of occurrence of such 
organisms in sitw over an area of any considerable extent. 
One opportunity of doing so is now (March 1897) presented 
