Cryptography.--Preservation of Telegrams.--The projector in
optical telegraphy.--Use of balloons. 4 figures. 8114

A New Style of Submarine Telegraph. 4 figures. 8115

A New Circuit Cutter. 2 figures. 8115

New Micro Telephonic Apparatus. 5 figures. 8116

Messrs. Kapp and Crompton's Measuring Instruments.
5 figures. 8116

IV. GEOLOGY, ETC.--Permeability of Sand Rock.--By F.H. NEWELL. 8103

The Grotto of Gargas, in the Pyrenees.--Paleontological
remains found therein. 2 engravings. 8103

Remarkable Wells and Caverns in Yucatan.--By ALICE D. LE
PLONGEON. 8105

V. NATURAL HISTORY.--The Cabbage Butterfly and the Peacock
Butterfly. 8105

VI. BOTANY AND HORTICULTURE.--The Bhotan Cypress (Cupressus
torulosa).--With engraving. 8106

The Pitcher Plant. 8106

What is a Plant? 8106