CHAPTER XXVIII 
A CLASS LIST OF PREPARATIONS 
Where a regular course in histology is conducted, it is a good plan 
to give each student at the outset a complete list of the preparations 
which he is expected to make. In a three months’ course a fairly 
representative collection of preparations can be made. The avail¬ 
ability of material determines what a list shall be. Besides gaining 
an introduction to the use of the microscope and its accessories, a class 
meeting ten hours a week for twelve weeks should be able to do as 
much work as is outlined below. 
In making the mounts, the order indicated in the list should not 
be followed. Begin with temporary mounts, and then study, in 
succession, freehand sections (the glycerin method), the Venetian 
turpentine method, the paraffin method (the celloidin method), and 
special methods. A large proportion of the time should be devoted 
to the paraffin method. 
It is neither possible nor desirable that each student should in 
every case go through all the processes from collecting material to 
labeling. Some of the material may be in 85 per cent alcohol, some 
in formalin, some in glycerin, some in Venetian turpentine, and some 
in paraffin. One student may imbed in paraffin enough of the 
Anemone for the whole class; another may imbed the Lilium stamens; 
and by such a division of labor a great variety of preparations may 
be secured without a corresponding demand upon the time of the 
individual. 
LIST OF PREPARATIONS 
THALLOPHYTES 
SCHIZOPHYTES 
MYXOMYCETES 
1. Trichia varia .—Paraffin sections, 5 (jl. Safranin, gentian-violet, orange. 
SCHIZOMYCETES 
2. Bacteria. — Coccus, Bacillus, and Spirillum forms. Stain on cover-glass 
or slide. 
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