which is added a
Lecture on Platinum. By M. FARADAY. Edited by W. CROOKES. Illustrated.
l6mo, Cloth, $1.00.

FARADAY'S PHYSICAL FORCES. Physical Forces. A Course of Six Lectures on
the Various Forces of Matter, and their Relations to Each Other. By M.
FARADAY. Edited by W. CROOKES. Illustrated. 16mo, Cloth, $1.00.

FRENCH AND GERMAN.

FRENCH PRINCIPIA, PART I. A First French Course: containing Grammar,
Delectus, and Exercise-Book, with Vocabularies. On the Plan of Dr.
Smith's _Principia Latina_. 12mo, Cloth, 50 cents.

FRENCH PRINCIPIA, PART II. A First French Reading-Book. Containing
Fables, Anecdotes, Inventions, Discoveries, Natural History, and French
History. With Grammatical Questions, Notes, and a Copious Etymological
Dictionary. On the Plan of Dr. Smith's _Principia Latina_, 12mo, Cloth,
80 cents.

GERMAN PRINCIPIA, PART I. A First German Course. Containing Grammar,
Delectus, Exercise-Book, and Vocabularies. On the Plan of Dr. Smith's
_Principia Latina_. 12mo, Cloth, 50 cents.

GERMAN PRINCIPIA, PART II. A First German Reading-Book. Containing
Fables, Anecdotes, Natural History, German History, and a Comedy. With
Grammatical Questions, Notes, and a Dictionary. On the Plan of Dr.
Smith's _Principia Latina_. 12mo, Cloth, 80 cents.

COMFORT'S GERMAN PRIMER. A German Primer. By GEORGE F. COMFORT, A.M.
12mo, Half Leather, 50 cents.

COMFORT'S FIRST BOOK IN GERMAN. A First Book in German. By GEORGE F.
COMFORT, A.M. 12mo, Half Leather, 60 cents.

COMFORT'S FIRST GERMAN READER. The First German Reader: to succeed the
"First Book in German." By GEORGE F. COMFORT, A.M. 12mo, Cloth, 50
cents.

OBJECT LESSONS.

WILLSON'S MANUAL OF OBJECT LESSONS. A Manual of Information and
Suggestions for Object Lessons, in a Course of Elementary Instruction.
By MARCIUS WILLSON. 12mo, Cloth, $1.00.

CALKINS'S PRIMARY OBJECT LESSONS. Primary Object Lessons, for Training
the Senses and Developing the Faculties of Children. A Manual of
Elementary Instruction for Parents and Teachers. By N. A. CALKINS.
Fifteenth Edition. Rewritten and Enlarged. 12mo, Cloth, $1.00.

* * * * *

Published by HARPER & BROTHERS, New York.

_Sent by mail, postage prepaid, to any part of the United States, on
receipt of the price._

[Illustration: SOME ANSWERS FROM OUR SUBSCRIBERS TO WIGGLE No. 12; OUR
ARTIST'S IDEA OF THE SAME; AND NEW WIGGLE, No. 13.]

The following is a list of the names of those who sent