S. Haughton— Mechanical Work done by a Muscle. 188 
The flood unquestionably preceded the ending of the ice; 
for, as already stated, only a melting glacier could have af- 
forded the vast quantities oe — required to fill and flood 
the wide valleys, and have set loose, simultaneously, the im- 
mense amount of sand, eonvels on stones, that were at the dis- 
S. 
The flood appears also to have risen rapidly to its height; 
for (1) the transition from the finer deposits to es upper coarser 
stratum is generally rather abrupt, and (2) at the lower extrem- 
ity of the Quinnipiac valley, the change in the structure of 
the beds, from tide-made to flood-made, marked in the reversal 
of the oblique aac (page 173) took place along a wel 
defined plane without any — and was visible also in 
the color of the deposited san 
Finally, the flood was a nastil termination of that winter of 
winters: especially as the rigors of the Glacial climate had 
passed, and a lower level of the high-latitude lands was bring- 
ing ona time of warmer climate than the present—the era 
when even Britain was occupied ks wild beasts of the warm 
temperate zone. 
Art. XXV.—On the Mechanical Work done by a Muscle before 
exhaustion, and on the “Law of Fatigue ;” by the Rev. SAMUEL 
Havauron, M.D., Trinity College, Dublin. 
In the February number of this Journal, for the present 
year, a paper is published by Professor F. EK. Nipher, contain- 
ing experiments to illustrate the mechanical work done by a 
muscle (or a group of prise before exhaustion. Tn Pa 
the present paper: 
1. That both series of experiments made by Professor ae peer 
are a sainatie contribution to the facts of animal mec 
at they not only consistent with the “ hing of 
Fatigue” proposed by me, but sHuseate both that law and my 
- —— of Refreshment. 
hat Professor Nipher's discussion of his own valuable 
