USEFUL APPARATUS. 2I1I 
years ago. Puccinia galiorum, Bedstraw brand, on Galium aparine 
should be looked for now and also in October, as I found it last 
year in the latter month. The asparagus brand, P. asparagz, may 
now be met with. I have once found it when stopping at Ashford- 
in-the-Water, near Bakewell. The Iris Puccinia, and others named 
by Dr. Cooke, I have never yet been able to find. 
In looking over my own gatherings of micro-fungi I have fre- 
quently been reminded of the fact that a considerable number of 
them I have met with but once, while others come to the front 
every year as regularly and as plentifully as daisies or buttercups. 
Some that I once thought very rare I now find frequently, and 
some others that I felt inclined to think common I have never met 
with. Probably this also may be the experience of other students. 
The only wise plan of research is for the student to look out every 
where whenever an opportunity arises in both likely and unlikely 
places, and he will not unfrequently be rewarded by finding in the 
latter unexpected treasures, which will amply repay him for any 
trouble he may have taken. 
THOMAS BRITTAIN. 
USEFUL APPARATUS. 
YLWARD’S “CONCENTRIC” TURNTABLE,—Having 
had the opportunity of examining this instrument upon several 
occasions, we have no hesitation in saying that it will be found to 
possess for the practical microscopist many advantages over the 
forms of self-centering turntables that have hitherto been before 
Fig. 40. 
the public. It essentially consists of two plates, the inner revolving 
on.a pivot, whilst the outer revolves concentrically on the inner, a 
few small pins being so arranged that by a single turn of the outer 
ring they firmly grasp the glass slide, and cause its centre to exactly 
coincide with the centre of the turntable, whilst a simple reverse 
movement instantly liberates it. This turntable answers for 
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