OBSERVATIONS AND EXPERIMENTS ON ROSE OIL. 
147 
No. 4. 
Sulphate of lime.6'3 
Sugar.12-5 
Honey. . . *.8P2 
100-0 
Sugar is easily detected by the microscope, for not only are the crystals 
easily distinguished, but generally the sugar-itch insects occur in the field of 
vision in great number, and in all stages of growth (Fig. 3). 
Fig. 3.—Honey Adulterated with Brown Sugar, showing Acari. 
Magnified 265 diam. 
(Several specimens on the table were obtained by dissolving honey thus adul¬ 
terated, and straining through fine cambric.) 
I believe, however, that a great deal of honey is imported from the Continent 
that is largely adulterated with starch-sugar ; this being so nearly identical 
with the true glucose of honey itself, the imposture is almost impossible to prove 
satisfactorily. 
In reply to the President, Mr. Stoddart explained the details of his method for 
getting deposits of sucrose from flowers for microscopic examination. He washes a 
number of flowers in a very small quantity of water, adds lime, removes this again by 
carbonic acid, obtaining a drop or two of a filtrate from the edge of a piece of blotting- 
paper, upon which the turbid liquid is placed. 
The thanks of the Conference were voted to the author of this paper, and subsequently 
to the other essayists as their papers were read. 
OBSERVATIONS AND EXPERIMENTS ON ROSE OIL. 
BY DR. F. A. FLiiCKIGER, OF BERN. 
The essential oil of roses is, in many respects, one of the most interesting 
L 2 
