THE MYXOSPORIDIA, OR PSOROSPERMS OF FISHES. 69 
the name ot the person collecting, and particularly that of the person 
identifying it. 
Microscopic technique.—Especially the fixation process and the stains 
found most useful should be mentioned. 
Parasite.—Besides the indications contained in the above outline for 
arrangement, the gaps in the Tabular Key (pp. 138-165) offer an invit- 
ing field for future work. One other point should receive most careful - 
attention, viz, a close comparison of the (at present probably unduly 
multiplied) forms habitant upon the same host, and especially those in 
- the same organ of the same host. In this way a few years will suffice 
to condense the present synonymy to its proper dimensions. It may 
be added that even the dimensions of the spores—the most accurate 
of all data—are sometimes omitted. 
Effects and epidemics.—Above all, attention should be directed to 
gathering accurate data as to the extent, the species of fishes affected 
and those exempt, the territory invaded, the season, as far as possible 
the relative potency as causative factors of temperature, water pollu- 
tion, etc. The effects of all remedies tried, whether successful or not, 
should of course be recorded. 
Reduction of measurements.—The older authors recorded their meas- 
urements in thousandths of a line.! I have reduced these to ws. 
Owing to the number of inches (also, consequently, of lines) in use in 
Germany, the original measurements are quoted in parenthesis. In 
1853 Robin” reduced the German measurements to decimals of a milli- 
meter. Heassumed 1//’ = 2.25 mm. _ Biitschli? adopts the same equiv- 
alent for the “‘ Linie” (/’). Wherever my results differ from Robin’s 
I have noted his figures in parenthesis along with the original measure- 
ments. 
The following are the calculations and the resulting equivalents 
adopted: 
One Prussian foot = 1:0298 English feet. 
One Prussian inch = 1:0298 English inches. 
One m. = 39°371 English inches = 38:2317 Prussian inches. 
One mm. = 0:0382317 Prussian inches =: 0:45878 Prussian lines. 
Thus 1 ‘ Linie” = 2:18 mm. nearly instead of 2:25 mm. 
Fortunately the discrepancies are slight. All spore-measurements 
are in ws; cyst measurements in decimals of a millimeter. 
As regards the translations, I am responsible for all, with the excep- 
tion of Kolesnikoff’s article the translation of which was made by 
Mr. Israeli, of the Surgeon-General’s Library. Dr. Robert Stein, of 
1JIn the only case where I could find a direct comparison between Miiller’s “‘Linie” 
and the millimeter, viz, Miiller’s translation of Gluge’s 35 of a mm. for Glugea 
anomala (Gluge, Bull. Acad. Roy. Belg., 1838, v, p. 774; Miiller, Miiller’s Archiv., 
1841, p. 491), as 0:0020’’’, Miiller regards the former as equal to 2 mm. 
2 Hist. Nat. des Végét. Parasites. 
3See Chloromyxum mucronatum (p. 264). 
