444 MICROSCOPY. 
These lines I found more difficult than the transverse ones on Am- 
phipleura pellucida, but patent enough to be accurately counted. 
It appears then that Dr. Woodward was correct in regarding the 
longitudinal striz of Dippel as diffraction phenomena, for they 
were much coarser than the true lines, being as given by him only 
about 50,000 to the inch. 
Thus far everything was done with ease. Then with care the 
bright apparently raised lines were transformed into rows of beads, 
this resolution into dots being accomplished in a satisfactory 
manner. 
The results stated above have been repeatedly verified. I also 
resolve into beads, with the <4, Navicula crassenervis, Striatella 
unipunctata and any Pleurosigma.—G. W. MOREHOUSE. 
Mourn on Breap.— Messrs. Rochard and Legros express the 
belief, in “ Comptes Rendus,” that this frequent parasitic vegeta- 
tion is due rather to the poor quality of the flour, or to bad man- 
agement, than to the presence of germs in the air, and that it may 
be prevented by adding an excess of salt to the bread. 
Errects or Dyerxe Woot.—M. Dumas has been investigating 
the question whether wool, and similar hairs, are penetrated by the 
coloring material, or only colored externally in the process of 
dyeing. In fresh wool he found all the layers perfect; but in 
bleached wool the outer or cortical layer was marred or destroyed- 
Fibres dyed with indigo, without boiling, contained granules of the 
coloring matter between the cells; while hairs which had been 
boiled in alumina and iron solutions appeared twisted or corroded. 
Microscoric Eyes.—In the absence of any further information, 
and indeed in spite of any possible information, the newspaper 
story of the boy with microscopic eyes may safely be regarded = 
a curious hoax, founded on the magnifying power of shortsighted 
eyes as compared with longsighted ones. One eye may be calcu- 
lated to form an image twice as large as another eye, or, by 2% 
extraordinary deformity, several times as large; but it would be 
no longer a human eye if capable of giving the high powers of the 
microscope. That the author of the hoax did not even aim at 
consistency or plausibility is seen in the representation that the 
boy was able to use for ordinary purposes the eyes that were capa- 
ble, unaided, of resolving diatoms. 
