TO CORRESPONDENTS. 
We have to acknowledge the receipt of a Communication from Mr. Dowpgy. 
———— 
PHARMACOPCIA LONDINENSIS, 
Iterum recognita et retractata, 1824, p. 6. 
“ ACIDUM ACETICUM FORTIUS,” 
vel 
—S Sew oO ne ee 
“ Acidum Aceticum & Ligno destillatum.” 
URE CONCENTRATED ACETIC ACID, agreeable to the Sample 
P furnished at the request of the Committee of the Royal College of 
Physicians, may be had of the Manufacturers, BEAUFOY & CO. South 
Lambeth, London. 
This day is published, in One Volume Octave, 
Price 10s. 6d.’in boards, 
COMPARATIVE VIEW of the DIFFERENT INSTITUTIONS 
for the ASSURANCE of LIVES, 
By CHARLES BABBAGE, Esq. 
M.A. F.R.S. L. & E, &c. 
containing Remarks on the following Subjects: 
On the Tables of Mortality employed for calculating the Premiums of 
Assurances.—On the different Kinds of Societies for the Assurance of 
Lives.—On the Rates of ”remiums.—On the Proportion of Profits re- 
turned to the assured.—On the Mode of assigning the Bonus to the 
assured. —On the Periods at which Assurers become entitled to partici- 
pate in a Division of Profits. —With an Appendix, containing a variety 
of Tables, amongst which are a Table of Mortality amongst Assurers— 
the Premiums charged at all Ages by the various Offices—and a Table of 
the Profits made by each, &c. &c.—Printed for J. Mawman, Ludgate- 
street. 
pa 
ENGRAVINGS IN THE PHILOSOPHICAL MAGAZINE, 
illustrative of the following Subjects: 
Vol. LIV. 1. Menai Bridge.—2. Mr. Lowe’s Mercurial Pendulum.— 
8. Mr. Hare's Calorimotor, a new Galvanic Instrument.—4. Capt, Sa- 
srne’s Illustration of Irregularities observed in the Direction of the 
Compass Needles of the Isabella and Alexander; and Mr, ScoresBy’s — 
Anomaly in the Variation of the Magnetic Needle. ro ae 
Vol. LV. 1, Comet’s Path of July 1819.—2. Annular EclipseoftheSun, 
Sept. 7.—3. Mr. Lane's Instrument, for gathering Fruit; Mr.Youne’s 
Mode of preparing Opium from the Papaver somniferum; and Captain For- 
MAN’s Essay on a Property in Light —4. Mr. Curusert’s Hydro-pne 
matic Apparatus, &c—5. Capt. Forman’s Essay on the Reflection, 
of Light; Mr, C. Bonnycasrve on the Influence of Masses of Iron 0 
Compass. ae 
