346 Mr. Bowman on Natural Terraces 
The Rotifer vulgaris travels quite at his ease in these pro- 
tuberances; he traverses the partitions, displaces the chromule 
and pushes it to the two extremities of the vesicle, so that 
this appears darker at these parts. One day I opened a pro- 
tuberance gently: I waited to see the Rotifer spring out and 
enjoy the liberty so dear to all creatures, even to infusorial 
animals ; but no—he preferred to bury himself in his prison, 
descending into the tubes of the plant, and to nestle himself in 
the middle of a mass of green matter rather than swim about 
freely in the neighbourhood of his dwelling. 
Some of these protuberances had greenish threads appended 
to their free end, and others had none: I thought at first that 
these threads were some mucus from within, escaped through 
some opening which might have served the Rotifer as an en- 
trance ; but an attentive and lengthened observation convinced 
me that in this there was no solution of continuity, and that 
the arrival of the Rotiferi in the Vaucheriz was not at all to 
be explained in this way. How are these parasitic animalcules 
generated within them? ‘This is what further research has 
some day to show. Meanwhile, I have thought that it should 
be made known, that the animalcule found in the Vaucheriz 
by Unger was the Rodifer vulgaris of zoologists. 
XLI.—On the Natural Terraces onthe Eildon Hills being 
formed by the Action of Ancient Glaciers. By J. KE. Bow- 
MAN, Esq., F.L.S. & F.G.S. 
ScaRcELY could my communication on these terraces in the 
last Number of the Annals have been set in type, when I saw 
the first announcement, by Prof. Agassiz, of the evidences he 
had seen of the former existence of Glaciers in Scotland. A 
little reflection, aided by my own recollections of the Swiss 
glaciers, and of the general views so ably given by him at 
the late meeting at Glasgow, soon satisfied me that his theory 
would meet all the difficulties that had so much perplexed me, 
and explain the actual appearances exhibited on the hills in 
the neighbourhood of Galashiels. I regret that I was not 
aware of his discovery when I wrote my remarks; though it 
must be allowed that my ignorance of it has saved me from 
the imputation of any bias in applying it to the phenomena 
in question. 
As the fact of the former existence of glaciers in Scotland 
is now exciting general attention, and will soon, I doubt not, 
be firmly established, I might have silently left it to others to 
consider them as the true cause of these terraces, had not a 
