ZOOLOGY AND BOTANY, MICROSCOPY, ETO. 
523 
The first portion of the book treats of the suitable reactions and methods 
employed in the identification of the different elements. In the second 
part the author attempts to give a systematic scheme of examination, 
although at present a general scheme at all comparable with those used 
in ordinary analysis is impossible. The concludiug portion of the work 
shows the application of the method to ores, alloys, rocks, &c. 
“A Little Diversion from the daily cares often comes to those in 
active business life. Here are some trifles that have come to hand from 
time to time, which we will share with our readers. 
One earnest student, on inspecting the Microscope which we then 
knew as the £ Histological,’ inquired, having some familiarity with the 
name, whether this is the ‘ Historic Microscope ’ ? 
Another — we think he was a £ first-year man ’ — made careful inquiry 
whether we keep the binaural Microscopes? We do not; Microscopes 
have not yet reached this stage of development, but we make an excellent 
binocular, of beautiful adjustment, that we can highly recommend. . . . 
Did you ever hear of a mythological Microscope ? We did, once. 
Can it be a Microscope for the study of rock sections ? 
An £ emersion ’ objective surely must be a dry lens — what say the 
etymologists ? 
A daily paper speaks of the wonderful homogeneous inversion object- 
glasses. 
Do our readers know of any objective powerful enough to £ dissolve 
the striae of Amphipleura ’ ” * * * § 
££ Some students may have the Leitz’s mechanical stage. The 
following directions copied from the American edition of Leitz’s £ Cata- 
logue of Microscopes and Accessories,’ published by Richards & Co., of 
New York, may enable them to apply the apparatus to their stands. 
£ The screw on the right must be lost so, that the lever, of the form of 
an arc of a bow, can turn around the axis at which it is fixed on the left. 
Afterward, the stage is to be put on the stage of the Microscope so, that 
both angle pieces, opposite to the lever, drives the column of the stand ; 
after putting the lever to its place, the screw gets fastened again. At 
last, the stage, must be fixed to column, by drawing close the other 
screw, being in the middle part of the lever.’ ” j 
B. Technique. t 
Zimmermann’s Botanical Micro-technique.§ — Prof. J. E. Humphrey 
has published an English edition of this useful work, with notes. It is 
a complete handbook for the botanical laboratory, treating of the follow- 
ing subjects : — The observation of living plants and tissues, the in- 
vestigation of dead plants, maceration, swelling, clearing, live staining, 
fixing and staining methods, and microtome technique. 
* Microscopical Bulletin, xi. (1894) pp. 9 and 10. 
f Amer. Natural., xxviii. (1894) p. 550. 
X This subdivision contains (1) Collecting Objects, including Culture Pro- 
cesses; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes; 
(4) Staining and Injecting; (5) Mounting, including slides, preservative fluids, &c.; 
(6) Miscellaneous. 
§ ‘ Bot. Microtechnique,’ by Dr. A. Zimmermann. Translated by J. E. Hum- 
phrey, S.D., xii. and 296 pp. New York, 1893. 
