326 Drs Hoppe and Hornschuch’s Tmr to the Adriatic, fyc* * 
a rich and fertile tract of country. From Padua we had a walk 
of fifty hours, which we accomplished in five days, favoured, as 
we were, with a continually clear sky, and warm weather. Even 
the thunder storm at Cantzien did not delay our progress ; for 
we employed the interval in eating our dinners. We are there- 
fore justified in saying, that the remembrance of this little tour 
will afford us pleasure as long as we live, notwithstanding that 
Venice is the worst place in the world for a botanist We have 
examined to-day the contents of our presses, and found, amongst 
other things, that Hdleborus viridis , which had never been re- 
moved from the papers in which it was first placed, was extreme- 
ly well preserved, and retained its colour perfectly. This we 
attributed to the plenty of warmed paper which we made use of.’ 1 
( To be continued ). 
Art. XIII. — Description of a New Refecting Microscope, 
By David Brewster, LL.D. F. B. S, Lond. & Sec. It. S. 
Edinburgh, &c. &c. 
The various forms which have been given to the Reflecting 
Microscope are necessarily derivable from those which have 
been given to the Reflecting Telescope ; and the one instru- 
ment is nothing more than the other either inverted, or modified 
for the examination of near objects. 
The reflecting microscope of Dr Barker * is the Gregorian te- 
lescope lengthened, so as to permit it to act as a microscope. 
The reflecting microscope of Dr Smith is the Cassegrainian tele- 
scope, with this difference only, that the convex mirror is per- 
forated to allow the rays of the object to pass through it, where- 
as, in the telescope, the rays pass without the convex mirror*)*. 
The microscope of Professor Amici of Modena is also an inver- 
sion of the Newtonian telescope ; and the reflecting microscope 
which I have proposed in the article Microscope, of the Edin- 
* See Phil. Trans. 1736, vol. xxxix. p. 259. 
*j* A microscope will perform very well, when it is made exactly like the Cas- 
segrainian' telescope* 
