o.

* * * * *

DETERMINATION OF STARCH.

According to Bunzener and Fries _(Zeitschrift fur das gesammte
Brauwesen_), a thick, sirupy starch paste prepared with a boiling one
per cent solution of salicylic acid is only very slowly saccharified,
and on cooling deposits crystalline plates of starch. For the
determination of starch in barley the finely-ground sample is boiled for
three-quarters of an hour with about thirty times its weight of a one
per cent solution of salicylic acid, the resulting colorless opalescent
liquid filtered with the aid of suction, and the starch therein inverted
by means of hydrochloric acid. The dextrose formed is estimated by
Fehling's solution. The results are one to two per cent higher than when
the starch is brought into solution by water at 135 deg. C.

* * * * *

A catalogue, containing brief notices of many important scientific
papers heretofore published in the SUPPLEMENT, may be had gratis at this
office.

* * * * *

THE SCIENTIFIC AMERICAN SUPPLEMENT.

PUBLISHED WEEKLY.

TERMS OF SUBSCRIPTION, $5 A YEAR.

Sent by mail, postage prepaid, to subscribers in any part of the United
States or Canada. Six dollars a year, sent, prepaid, to any foreign
country.

All the back numbers of THE SUPPLEMENT, from the commencement, January
1, 1876, can be had. Price, 10 cents each.

All the back volumes of THE SUPPLEMENT can likewise be supplied. Two
volumes are issued yearly. Price of each volume, $2.50, stitched in
paper, or $3.50, bound in stiff covers.

COMBINED RATES--One copy of SCIENTIFIC AMERICAN and one copy of
SCIENTIFIC AMERICAN SUPPLEMENT, one year, postpaid, $7.00.

A liberal discount to booksellers, news agents, and canvassers.

MUNN & CO., PUBLISHERS,

361 BROADWAY, NEW YORK, N. Y.

* * * * *

PATENTS.

In connection with the SCIENTIFIC AMERICAN, Messrs. MUNN & Co. are
Solicitors of American and Foreign Patents, have had 39 years'
experience, and now have the largest establishment in the world. Patents
are obtained on the best terms.

A special notice is made in the SCIENTIFIC AMERICAN of all Inventions
patented through this Agency, with the name and residence of the
Patentee. By the immense circulation thus given, public attention is
directed to the merits of the new patent, and sales or introduction
often easily