363 
of simple alimentary substances, &c. 
principles in which the following method of analysis is 
founded ; the only novelty in which, therefore, is the form of 
the apparatus ; and of this it is hoped the following summary 
sketch, and annexed figures, will convey every requisite 
information. 
Fig. 1, Plate XIV, represents a front view or elevation of 
the whole apparatus in the act of being employed. A B is a plat¬ 
form, two feet square, surrounded by a ledge about inches 
high, for preserving any mercury that may chance to fall 
about, and furnished with four adjusting screws (of which two, 
C C, are sectional views), by means of which it may be placed 
perfectly horizontal. Into this platform, in the manner repre¬ 
sented, are fixed perpendicularly four square pillars, DE, DE, 
about four feet and a half high, at the top of which is placed 
another small platform, F F, abou^- four inches wide, and 
which may be fixed or removed at pleasure by means of the 
brass pins ab, ab. II are glass tubes graduated with the 
utmost care to hundredths of a cubic inch, and which are 
cemented at bottom into semicircular iron tubes enclosed in 
the blocks KK (as represented by the dotted lines). These 
iron tubes project a little below the wood at the lower part, 
where they are furnished with iron stop-cocks, S S, for draw¬ 
ing olf the mercury when it may be necessary. Into the 
other end of these semicircular tubes are likewise cemented 
the glass tubes L L (of smaller dimensions, and a little longer 
than the tubes II), and forming with them, when taken toge¬ 
ther, inverted syphons. The smaller tubes, LL, are repre¬ 
sented as surmounted by funnels, RR, furnished with stop¬ 
cocks, the object of which is to permit the mercury to flow 
into them with any velocity that may be required. On the 
