156 THE MICROSCOPICAL NEWS. 
seven figures, and goes to show that if we only take one shrub or 
tree, there is enough in that alone to occupy the serious attention 
of the microscopist for a lifetime, while a common weed from the 
roadside will be found scarcely less interesting. Mr. Fisher has 
put his matter in exceedingly good form, 
Back NUMBERS OF THIS JOURNAL.—We have succeeded in 
securing two complete sets of vol. I. The price, bound in cloth 
and sent post free, is fifteen shillings. Application for these 
should be made early, to the Editor. 
Only a few complete sets of vol. II. remain in stock. 
Opjyects MountTepD ‘ OPAQUE” IN BALSAM.—At the last meet- 
ing of the Manchester Microscopical Society, Mr. E. Ward pre- 
sented a communication upon the above subject ; we expect to be 
able to print it in our next issue. 
THE Ova or ROTIFERS IN THE INTERIOR OF VOLVOX GLOBATOR. 
—Mr. Fleming, of Manchester, has, we understand, exhibited 
some very interesting specimens of the above. We hope to give 
amore detailed description later on. They are best seen with a 
spot lens. 
WorkING Distance.—Upon going to press we have been asked 
to state the working distance of Leitz homogeneous one-twelfth ob- 
jective. It is o’or5 inch, or equal to that of many dry “ quarters” 
of Ifo’ in alr. 
OBJECTIVES OF ENGELBERT AND HENsoLpt.—We have lately 
had a series of these objectives for trial. They were as follows :— 
Working Real Angle 
Designation. Distance. Focal Aperture. in 
Inch. Length. Air. | 
One (finvel aaeeae me OL37 ose 0.02 vos 
Half pruemieebeics O22" ae, sO:5T oes. aie ee ei 
°o 
Quarter ica koi sae 0.05... 0.20 <.. «5 Ola 
= . ° 
Orie ele Ul eee toe ponies 0:03 .... 0.14  ... <Q 
° 
Onetentia 4, -----c0=: 0.01 ... 0,098. .:.. GauE eames 
The one inch and the one-tenth we were much pleased with. 
