126 THE MIcROSOOPE. 
TRANSACTIONS OF THE AMERICAN DERMATOLOGICAL ASSOCIATION, at its 12th 
Annual Meeting. Boston, 1888, 
This volume contains the proceedings of this society at its last 
meeting held at Washington, together with the abstracts of a num- 
ber of valuable papers on dermatology, presented at the time. 
SreconD Report ON EXPERIMENTAL PsycHoLoGy: Upon the diagram tests. 
By Prof. Charles Sedgwick Minot. 
PREVENTION OF YELLOW FEVER IN FLORIDA AND THE SouTH. By W. C. 
van Bibber, A. M., M. D. 
THE TREATMENT OF SIMPLE CHRONIC RHINITIS. By Charles Merz, M. D. San- 
dusky, O. Reprint. 
Foop vERsuUs BAcrLLI IN CONSUMPTION. An open letter from Ephraim Cut- 
ter, M. D., LL. D., to hisson John Ashburton Cutter, M. D., B. Se., with 
answer. Reprint. 
Notes oN RuMBOLD’s METHOD OF TREATMENT OF CATARRHAL JNFLAMMA- 
TION OF THE UPPER Arr PassaGes. By Ely McClellan, M. D. Reprint. 
SUPPLEMENTARY NOTE on T. SacinaTa. By Frederick Tuckerman. Reprint. 
Microscopy: Reprints from American Naturalist. Dr. C. O. Whitman. 
CORRESPONDENCE AND QUERIES. 
Epiror Microscope: 
The article “Cement Varnishes and Cells,’ by Dr. Lyon, in the 
March number, is just bristling with useful points. I cannot help 
but add my little to the general fund. I have also found that 
every medium of an aqueous or glycerin nature, sooner or later 
softens all ordinary cell cements. JI have mounts of alge, ete., in 
copper solution, glycerine, and in solution of chloral hydrate, in cells 
of solution of sealing wax, and such similar cements, now about 
three years old; all showing the cement creeping in uniformly toward 
the center of the mount. All cells to be used for fluid or glycerine 
(other than alcoholic solutions) should be carefully covered with 
shellac. This may whiten where the fluid touches it, but it resists 
well. Cement down the cover with shellac also, and, as Dr. Lyon 
advises, back it by a more tenacious varnish. Lovett’s cement, 
which is white lead, 2; red lead, 2; litharge, 3; ground together with 
thin gold size to a working consistence; hardens more quickly than 
gold size, and seems to be entirely permanent. Mounts four years old 
prepared with this cement are still perfect in every respect, resisting 
glycerine, also weak alcoholic solutions. This cement is troublesome 
to prepare, and cannot well be kept for use like shellac varnish. 
Cells are, as a rule, made too deep, or too wide. The expansion and 
contraction of considerable bodies of fluid soon loosen any but very 
