48 tBOGRESS OF MICROSCOPICAL SCIENCE. [^TumL.^liTy 
tone of the statements in pages 481 to 484. Thus in dealing with 
the question as to the nature of an " inferior *' ovary, Dr. Masters 
infers that it is foliar, and as evidence of this he cites, among other 
circumstances, the proposition of " the morphological identity of 
axis and leaf-organ ; " but a little further on, discussing the origin 
of the ovule and its coverings, he declares, in a very positive 
manner, that the nucleus is axial and the coverings are foliar. 
Now, why should the principle apply in the one case more than 
in the other ? Perhaps Dr. Masters will explain. 
The great bulk of the text is, of course, of non-microscopical 
interest, but the treatise is necessarily one of high importance to 
the scientific botanist, and Dr. Masters must be complimented on 
having discharged so well a most difficult and tedious task. 
PKOGEESS OF MICKOSCOPICAL SCIENCE. 
Apparatus for Injecting Specimens. — An apparatus which is in some 
measure automatic, and which, at all events, does away with the necessity 
of a syringe, but which is hardly novel in conception, is described by 
Herr D. Toldt in the last number of Max Schultze's ArcMv fiir Mikro- 
shopische Anatomic (5 Band 2 Heft). The author gives an account of 
three methods increasing in complexity. The first consists simply of 
two flasks, and a tube for a mercurial column. The first flask contains 
the injection fluid, and its cork is perforated by two tubes — one carry- 
ing the fluid to the specimen, and the other connecting it with a second 
flask. This latter is connected with a long tube, funnel-shaped at the 
extremity, and into which mercury is poured. By this contrivance, 
the mercury pressing on the air in the first flask presses also on the 
air in the second, and thus the fluid is steadily compressed and forced 
into the vessels of the specimen. The mercury flask is provided below 
with a stop-cock, through which, when the mercury has descended from 
the perpendicular tube, it may be drawn off for subsequent use. The 
other two forms of apparatus are a little more complex, and need 
diagrams for their explanation, but the principle is much the same, 
water pressure being used instead of mercurial, and manometers 
being used to gauge the force with which the fluid is pressed on. Any 
one who has ever worked in a chemist's laboratory can readily under- 
stand how the pressure of an ordinary water-tap may be utilized for 
the purpose of injection. Herr Toldt's idea is based on the method 
so often adopted by chemists. 
The Beproductive System of Saprolegnia monoica. — Herr J. Eeinke 
has given a very minute account of this part of the developmental history 
of Saprolegnia. He describes very minutely the different steps in the 
formation of the oogonium, and details the production of the antheri- 
dia, and illustrates his observations by a plate. See Max Schultze's 
Arcliiv, ibid. 
Terminations of the Nerves in the Pancreatic and Salivary Glands. — 
Herr Pfliiger continues his researches on these points, but he does 
not add many facts to what he published a few years since. Pfliiger 's 
