PROGRESS OF MICROSCOPICAL SCIENCE. 
255 
observations on the lymph, of sheep-pox. It has been shown that the 
virus resides in the solid particles of the lymph and not in its fluid 
portion. These solid particles were shown to be identical with the 
organisms ( Schizomycetous Fungi), called by Cohn and Burdon San- 
derson " Micrococci " ; they are likewise produced by the pus-cells 
from the granules contained in their interior. Dr. Klein has produced 
the pocks on sheep by artificial inoculation of these germs. On 
examination of a pock so produced, the " micrococci " were found in 
the lymphatic spaces which are formed in the skin at an early stage. 
They occurred in masses or in myceloid threads. At a later stage 
signs of fructification were observed, and conidia of a Penicillium-like 
character were produced in the spaces. Tlie same growth is found in 
the cavities of the pustules subsequently developed. Dr. Klein also 
produced the disease by the injection of lymph directly into the vein ; 
the pustules formed were quite the same as those produced by inocu- 
lation, and the same Penicillium growth was found in their interior. 
These remarks were illustrated and supported by a series of drawings 
and by microscopical preparations. 
A Serious Error. — Dr. Thacker, who is the editor of the ' Cincin- 
nati Medical News,' and who is also a distinguished microscopist, has 
made a grave mistake in announcing that Messrs. Eoss have simply 
followed Mr. R. B. Tolles, of Boston, in their manufacture of new 
glasses. 1st. Messrs. Ross were unquestionably the first to introduce 
the new form of objectives which they have now for some years 
adopted. 2nd. They certainly have not adopted any of Mr. Tolles' 
ideas. The following statement therefore, which is made by the 
editor of the ' Cincinnati Medical News,' * demands correction : 
" It seems that since the superiority of R. B. Tolles', of Boston, 
new four-system lenses has been demonstrated, the distinguished 
English maimers of objectives are abandoning their old formulas and 
instituting new ones. At a late meeting of the Royal Microscopical 
Society, Messrs. Powell and Lealand exhibited two glasses on a new 
formula ; one, ^th, showing the lines of AmpMpleura pellucida, and the 
other, ith, showing Pleurosigma angulatum, -\- 4000. This object was 
illuminated by direct light. The effect was to show the interspaces 
remarkably magnified, and the beads comparatively small ; they stood 
out like minute spheres of pink coral on a white ground. 
" The Messrs. Ross also have determined to abandon their old con- 
struction from the l-inch upwards, and adopt one devised by Mr. 
Wenham. In the new combination, it is stated, a great increase of 
brilliancy and definition is obtained by dispensing with six surfaces 
formerly used. The higher powers, from ^th upwards, can be also 
used as immersion lenses by merely adjusting the collar to the mark 
' wet,' thus avoiding the cost of extra fronts and loss of time in changing 
them.— Ed/' 
A Fungus in a Flamingo. — Professor Leidy has read a paper before 
the Academy of Natural Sciences of Philadelphia,"]" which is in some 
measure similar to that which Dr. Murie published in this Journal 
* April, 1875. t January 17, 1875. 
