190 THE AMERICAN MONTHLY [ October, 
Among the other papers were the following :—The Gaczllus Malarie and 
the Means of Protecting the Human Race from Malaria, by Tomasi-Crudelli, 
of Rome; A New Method for the Certain Detection of 7. sfzralzs in Meat, 
by Dr. James A. Close, of Summerfield, Ils.; The Crystallography of 
nae by Dr. Thomas Taylor, of Washington, D. C.; Experimental Re- 
searches Concerning the Infectious Nature of Temas Tetanus, by Dr. E. 
O. Shakespeare, oe Phila., Penn. ; Experiments on the Seevene re Inocula- 
tion of Rattlesnake Venom, by Prof. Henry Sewall; The Production of 
Immunity by the Hypodermic Injection of Sterilized Cultures, by Dr. D. E. 
Salmon, of Washington, D. C.; Histological Alterations Following Ampu- 
tations in the Peripheral Nerves, the Spinal Ganglia, and the Marrow, by 
Dr. E. A. Horner, of Finland; and, The Basal Ganglia of the Brain as 
Psychic Centres, by Dr. Daniel Clark, of Toronto, Canada. 
The largest collection of slides was that of Mr. Reynolds, of Detroit. Mr. 
Heines, of Chicago, showed his freezing microtome, which, while ew, effi- 
cient, seems too bulky and cumbersome for general use. 
Bausch and Lomb and Queen & Co. had large exhibitions of instruments, 
but one looked in vain for samples of the work of foreign makers with 
which to compare the work of our own manufacturers. The exhibit of Mc- 
Intosh, of Chicago, was also noteworthy. 
The sections were well attended, and much work of scientific value was 
done; but, owing to the absence of the best men, both of our own and for- 
eign countries, it must be confessed that the Congress did not rise to the level 
of some of its predecessors. It cannot be doubted, however,’ that American 
medicine directly, and American science indirectly, have received a strong 
impetus from the Congress. 
The crystallography of butter and other fats.—III. 
By Dr. THOMAS TAYLOR, 
U. S. AGRICULTURAL DEPARTMENT, WASHINGTON, D. C. 
EXPLANATION OF PLATE IV. 
Figs. 1, 2, 4, and 11. Crystals of boiled oleo (Armour). X 70 to 140. 
Figs. 3, 5,6, 7,8, and 9. Crystals of boiled oleo in process of decay. Such 
fone are frequently observed in oleomargarine. 140. 
Fig. 10. The butter crystal as photogr: aphed by Detmers. 
Fig. 12. A crystal of oleo and lard made by Prof. Weber, which, he says, 
cannot be distinguished from that of pure butter. (See figs. 10 and 14). 
Figs. 13 and 15. Crystals of boiled butterine as prepared by Prof. Weber 
and photographed by Prof. Detmers, representing the butter crystal accord- 
ing to Prof. Weber. 
Fig. 14. The true butter crystal, photographed by the late Dr. Bernard 
Persh. Compare the above plate with the transition stages of butter crystals, 
Plate I. 
Cover-glass preparations in bacteriological investigations. 
By FERDINAND HUEPPE.* 
After it was discovered that the morphological elements in the blood dried 
in a thin layer were not materially altered by drying, Koch (1877) first em- 
* From ‘ MerHops oF BACTERIOLOGICAL INvEsT1GaTION, by F. Hueppe; translated by H. M. Biggs, M. D. 
New York. D. Appleton & Co. See this Journat, Vol. VI, p. 220. 
