2 
THe Microscope. 357 
in my drawing (Plate XII). Nobody ought to expect to see 
what I have illustrated, unless he be an expert in studying with 
an immersion lens, and this means a good deal. Every tyro, 
who peeps into the microscope every once in a while, considers 
himself an expert, entitled to add his mite to histology or mic- 
roscopy. He is much mistaken, indeed. It takes not months, 
but years of daily, hard study with good immersion lenses, be- 
fore one’s eye is educated for microscopical vision. I con- 
fidently maintain that novody will ever become an expert in this 
line of investigation, unless he be a draughtsman and be able to 
project on paper what he sees under the microscope, without the 
aid of prisms and other tovs. 
The cornea corpuscles or, if you choose, “cornea cells,” are 
now gorgeous dark blue formations altogether made up of an 
extremely delicate reticulum of a prevailingly rectangular course, 
in connection with the central, rather indistinct nuclei, the 
structure of which is likewise reticular, though of a coarser type 
than that of the surrounding protoplasm. The reticulum is not 
uniform in its distribution. In some places it is so dense as to 
be almost unresolvable by the lens; in others somewhat looser 
and more easily recognizable. No boundary lines are present 
between the corpuscles or their broad offshoots and the adjacent 
basis-substance, since innumerable dark violet, delicate, mostly 
conical offshoots penetrate the basis-substance itself from the 
borders of the former. The latter now appears to be reticular 
instead of granular, as with lower powers. The reticulum is 
much more delicate than in the protoplasmic bodies, the points 
of intersection in these being rather clumsy as compared with 
the minute nodules and threads pervading the basis-substance. 
It is obvious that only to the extreme delicacy of the reticulum 
in the basis-substance is due its pale violet color, in contradis- 
tinction to the dark violet formations in the cornea corpuscles. 
Let us concentrate our attention on the almost black, beaded 
threads before alluded to. Most of them, though somewhat 
varying in bulk, run a nearly parallel or rectangular course. 
They either traverse the dark violet corpuscles, running clear 
through them and through the basis-substance in order lastly to 
perish within a cornea corpuscle by inosculation with the dark 
violet reticulum held therein. Such threads approach often 
enough the nucleus of the cornea corpuscle and apparently blend 
