94 THE AMERICAN MONTHLY [May, 
A new photomicrographic apparatus. 
By A. G. FIELD, M. D., 
OF DES MOINES, IOWA. 
The apparatus is explained by means of the following references to the en- 
graving (plate V): 
a is the base, 14 X 14 X 5 inches; 6 
6 the uprights, 5 >< 1 inches, 7 feet high. 
The uprights are grooved on their edges 
to receive the tongues on the arms, cccc, 
of the secondary base and of the camera 
carrier.. The uprights are made firmer 
by additional pieces extending up 30 
inches from the base. £ is the second- 
ary base, 14 14 inches, adjustable as, 
to height and perforated for tube of mi- 
croscope when arranged for high ampli- 
fication. In low amplification the mi- 
croscope may be placed upon it. / is 
the pasteboard cone, with camera front, 
used in capying and in very high am- 
plification. The camera, g, is attached 
to the uprights by a sliding-box carrier, 
tongued for grooves in uprights. The 
stand is used upright in microphotogra- 
phy, for horizontal stage in work with 
fluids and unmounted objects, and hori- 
zontal in copying. The uprights are 
precisely perpendicular to the bases, 
ae. = which are centred by diagonal and 
Hig. parallel lines to facilitate arranging the 
Panini obhetemercstapbie eA pparaias! instruments in line and centre. 
Bank-note cement.—Soften 1 lb. of the best glue in water, boil to dis- 
solve, and strain it very clear; boil also 4 oz. of isinglass, previously softened 
by steeping in water; put the two together in a double glue-pot with 4 lb. of 
brown sugar, and boil the mixture until it is quite thick; then pour into 
plates or moulds. When cold, cut and allow to dry, when the pieces are 
ready for use.. They can be carried in the vest pocket. The cement is very 
useful for joining pieces of paper containing drawings, torn greenbacks, etc., 
as it immediately softens when applied to the tongue.— Chem. and Druggist. 
EDITORIAL. 
Elementary histology.—We have, during the progress of the current 
year of the Yournal work, received numerous letters from subscribers, some 
of which wefe kind and encouraging; for them we would desire to thank 
the writers, whose sympathy we are glad to have; others, while commenda- 
tory, mentioned features which the writers would desire to see introduced. 
To some of these requests for articles of particular character, we have been 
glad to respond where it has been within our power, and we shall continue 
the practice so far as practicable. It is, in part, in answer to such a request 
